| **Summary of Significant Accounting Policies - Product Warranty Liability (Details) (USD $)In Millions, except Per Share data, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 3 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
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| **Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Accrued product warranty and deferred warranty revenue, at beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  | $ 598 |  |   |  |   |  |   |  | $ 598 |  | $ 506 |  | $ 492 |  |
| Cost accrued and revenues deferred                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |                 |   |  |   |  |   |  |   |  |   |  | 571 | [1] | 407 | [1] | 269 | [1] |
| Product Warranty Accrual, Acquisitions                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |                 |   |  |   |  |   |  |   |  |   |  |   |  | 5 |  |   |  |
| Adjustments to pre-existing warranties                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 149            | [1]             | 104 | [1] | 123 | [1] | 30 | [1] | 27 | [1] | 25 | [1] | 404 | [2] | 79 | [2] | 51 | [2] |
| Payments and revenues recognized                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           |                 |   |  |   |  |   |  |   |  |   |  | (455) |  | (399) |  | (306) |  |
| Accrued product warranty and deferred warranty revenue, at end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 1,118          |                 |   |  |   |  |   |  |   |  |   |  | 1,118 |  | 598 |  | 506 |  |
| Less: Current portion                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 551            |                 |   |  |   |  |   |  |   |  |   |  | 551 |  | 263 |  | 252 |  |
| Noncurrent accrued product warranty and deferred warranty revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 567            |                 |   |  |   |  |   |  |   |  |   |  | 567 |  | 335 |  | 254 |  |
| Product Warranty Accrual, Increase (Decrease)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 28             | [1]             |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Product Warranty Accrual, Increase (Decrease), per share                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | $ 0.41         | [1]             |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Product Warranty Accrual, Preexisting Increase Decrease Per Share, Net of Tax                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | $ 2.16         |                 | $ 1.51 |  | $ 1.76 |  | $ 0.39 |  | $ 0.34 |  | $ 0.34 |  |   |  |   |  |   |  |
| Truck [Domain]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| **Extended Warranty Program:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Product Warranty Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |                 |   |  |   |  |   |  |   |  |   |  | 66 |  |   |  |   |  |
| Extended Warranty Programs [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| **Extended Warranty Program:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Deferred Revenue                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 364            |                 |   |  |   |  |   |  |   |  |   |  | 364 |  | 257 |  | 167 |  |
| Revenue recognized under extended warranty programs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |                 |   |  |   |  |   |  |   |  |   |  | 63 |  | 53 |  | 46 |  |
| Warranty contracts sold in current year [Member] | Truck [Domain]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| **Extended Warranty Program:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Product Warranty Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |                 |   |  |   |  |   |  |   |  |   |  | 19 |  |   |  |   |  |
| Product Warranty Accrual [Member] | Truck [Domain]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| **Extended Warranty Program:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Product Warranty Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |                 |   |  |   |  |   |  |   |  |   |  | 47 |  |   |  |   |  |
| Field Campaign to address issues in products sold [Member] | Truck [Domain]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| **Extended Warranty Program:**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |                 |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |
| Product Warranty Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |                 |   |  |   |  |   |  |   |  |   |  | $ 130 |  | $ 23 |  |   |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [1]The warranty estimation for engines sold in 2012 includes a factor for improvements to the design and manufacturing process that was based on historical experience. In the fourth quarter of 2012 we identified a deviation from historic experience and we recorded an adjustment for a change in estimate to increase in the costs accrued for warranty of $28 million, or $0.41 per diluted share for products sold in the first three quarters of 2012.[2]In the first quarter of 2012, we recorded significant adjustments for changes in estimates of $123 million, or $1.76 per diluted share. In the second quarter of 2012, we recorded significant adjustments for changes in estimates of $104 million, or $1.51 per diluted share. In the fourth quarter of 2012, we recorded significant adjustments for changes in estimates of $149 million, or $2.16 per diluted share. In the third quarter of 2011, we recorded significant adjustments for changes in estimates of $30 million, or $0.39 per diluted share. In the second quarter of 2011, we recorded significant adjustments for changes in estimates of $27 million, or $0.34 per diluted share. In the third quarter of 2010, we recorded significant adjustments for changes in estimates of $25 million, or $0.34 diluted share. |

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.
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| - Definition
Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.
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| - Definition
Total liability for standard and extended product warranties acquired in a business acquisition.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.
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| - Definition
Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.
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| - Definition
Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).
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| - Definition
Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.
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| - Definition
The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.
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