| **Postretirement Benefits Components of Net Periodic Benefit Expense (Income) and Other Amounts Recognized in Other Comprehensive Loss (Income) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]**                                                                                                                                             |           |            |   |   |   |
| Net postretirement benefits expense                                                                                                                                                                        |           |            | $ 169 | $ 179 | $ 233 |
| **Defined Benefit Plan, Amounts Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income) [Abstract]**                                                          |           |            |   |   |   |
| Prior service cost (benefit)                                                                                                                                                                               | 302            |            |   |   |   |
| Pension [Member]                                                                                                                                                                                           |           |            |   |   |   |
| **Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]**                                                                                                                                             |           |            |   |   |   |
| Service cost for benefits earned during the period                                                                                                                                                         |           |            | 17 | 18 | 15 |
| Interest on obligations                                                                                                                                                                                    |           |            | 189 | 209 | 234 |
| Amortization of net cumulative loss (gain)                                                                                                                                                                 |           |            | 97 | 98 | 72 |
| Amortization of prior service cost (benefit)                                                                                                                                                               |           |            | 1 | 1 | 1 |
| Curtailments                                                                                                                                                                                               |           |            | 2 | 1 | 6 |
| Contractual termination benefits                                                                                                                                                                           | 3              | 35              | 38 | 1 | 9 |
| Premiums on pension insurance                                                                                                                                                                              |           |            | 6 | 7 | 6 |
| Expected return on assets                                                                                                                                                                                  |           |            | 211 | 193 | 189 |
| Net postretirement benefits expense                                                                                                                                                                        |           |            | 139 | 142 | 154 |
| **Defined Benefit Plan, Amounts Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income) [Abstract]**                                                          |           |            |   |   |   |
| Actuarial net loss (gain)                                                                                                                                                                                  |           |            | 374 | 77 | 713 |
| Amortization of cumulative gain (loss)                                                                                                                                                                     |           |            | (97) | (98) | (72) |
| Prior service cost (benefit)                                                                                                                                                                               |           |            | 0 | 4 | 4 |
| Amortization of prior service benefit (cost)                                                                                                                                                               |           |            | (1) | (1) | (1) |
| Curtailments                                                                                                                                                                                               |           |            | (13) | (3) | 0 |
| Currency translation                                                                                                                                                                                       |           |            | 4 | 4 |   |
| Total recognized in other comprehensive loss (income)                                                                                                                                                      |           |            | 267 | (17) | 644 |
| Total net postretirement benefits expense (income) and other comprehensive loss (income)                                                                                                                   |           |            | 406 | 125 | 798 |
| **Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]**                                       |           |            |   |   |   |
| Amortization of prior service cost (benefit)                                                                                                                                                               |           |            | 1 |   |   |
| Amortization of cumulative losses                                                                                                                                                                          |           |            | 109 |   |   |
| Other Postretirement Benefit Plans, Defined Benefit [Member]                                                                                                                                               |           |            |   |   |   |
| **Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]**                                                                                                                                             |           |            |   |   |   |
| Service cost for benefits earned during the period                                                                                                                                                         |           |            | 8 | 8 | 6 |
| Interest on obligations                                                                                                                                                                                    |           |            | 56 | 81 | 117 |
| Amortization of net cumulative loss (gain)                                                                                                                                                                 |           |            | 4 | 8 | (2) |
| Amortization of prior service cost (benefit)                                                                                                                                                               |           |            | (29) | (20) | (5) |
| Curtailments                                                                                                                                                                                               |           |            | 11 | 2 | 0 |
| Contractual termination benefits                                                                                                                                                                           |           |            | 6 | (2) | 3 |
| Retrospective payments to retirees                                                                                                                                                                         |           |            | (15) |   |   |
| Premiums on pension insurance                                                                                                                                                                              |           |            | 0 | 0 | 0 |
| Expected return on assets                                                                                                                                                                                  |           |            | 41 | 40 | 40 |
| Net postretirement benefits expense                                                                                                                                                                        |           |            | 30 | 37 | 79 |
| **Defined Benefit Plan, Amounts Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income) [Abstract]**                                                          |           |            |   |   |   |
| Actuarial net loss (gain)                                                                                                                                                                                  |           |            | 566 | (127) | 180 |
| Amortization of cumulative gain (loss)                                                                                                                                                                     |           |            | (4) | (8) | 2 |
| Prior service cost (benefit)                                                                                                                                                                               |           |            | 302 | (341) | 0 |
| Amortization of prior service benefit (cost)                                                                                                                                                               |           |            | 29 | 20 | 5 |
| Curtailments                                                                                                                                                                                               |           |            | 0 | 0 | 0 |
| Total recognized in other comprehensive loss (income)                                                                                                                                                      |           |            | 893 | (456) | 187 |
| Total net postretirement benefits expense (income) and other comprehensive loss (income)                                                                                                                   |           |            | 923 | (419) | 266 |
| **Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]**                                       |           |            |   |   |   |
| Amortization of prior service cost (benefit)                                                                                                                                                               |           |            | (5) |   |   |
| Amortization of cumulative losses                                                                                                                                                                          |           |            | $ 37 |   |   |

| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Retrospective Payments To Retirees
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No definition available.
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| - Definition
Net postretirement benefit expense (income) and other comprehensive loss (income)
+ References
No definition available.
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| - Definition
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Currancy Translation Adjustment, before Tax
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of gains or losses recognized in net periodic benefit cost.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.
+ References
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| - Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.
+ References
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| - Definition
If applicable, the cost of providing special or contractual termination benefits recognized during the period on the projected benefit obligation.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.
+ References
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| - Definition
This element may be used to encapsulate any other periodic costs associated with defined benefit plans that are not separately disclosed.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The change in other comprehensive income due to the amortization of the net prior service costs (credit) into net periodic pension costs.
+ References
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| - Definition
The pretax cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that occurred during the period. The cost has not yet been recognized in net periodic benefit cost. A plan amendment includes provisions that grant increased (decreased) benefits based on service rendered in prior periods.
+ References
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| - Definition
Amounts recognized in other comprehensive income (but not yet recognized in net periodic benefit cost), including the net gain (loss) and net prior service cost (credit) arising during the period. Also includes reclassification adjustments out of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.
+ References
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| - Definition
Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.
+ References
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| - Definition
Pre-tax gain (loss) adjustment to other comprehensive income resulting from the settlement or curtailment of the entity's defined benefit pension and other postretirement plans. A settlement is defined as a transaction that (a) is an irrevocable action, (b) relieves the employer or plan of a primary responsibility for a pension benefit obligation, and (c) eliminates significant risks related to the obligations and the assets used to effect the settlement. A curtailment is an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net gain (loss) previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.
+ References
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