| **Acquisition and disposals of business (Narrative) (Details) (USD $)In Millions, unless otherwise specified**                           | 12 Months Ended |         |         |         |        |        | 12 Months Ended |        |        |        | 12 Months Ended |        |        |         | 12 Months Ended |        |        |        | 12 Months Ended | 3 Months Ended | 2 Months Ended |         |        |
|------------------------------------------------------------------------------------------------------------------------------------------|-----------------|---------|---------|---------|--------|--------|-----------------|--------|--------|--------|-----------------|--------|--------|---------|-----------------|--------|--------|--------|-----------------|----------------|----------------|---------|--------|
||
| **Business Acquisition [Line Items]**                                                                                                    |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Equity Method Investment, Ownership Percentage                                                                                           |            |    |    | 100.00% | 50.00% |   | 75.00%          | 49.00% | 51.00% |   |            |   |   |    | 75.00%          | 51.00% |   |   |            |           |                |    |   |   |   |   |   |
| Long-term debt                                                                                                                           | $ 4,856         |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            | $ 1,980        | [1]            | $ 1,986 |   |   | $ 40 | $ 40 | $ 0 |
| Debt instrument, principal repayment term (years)                                                                                        |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    |   |   | 4 years |   |   |
| Debt Instrument, Number Of Installment Payments                                                                                          |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    |   |   | 16 |   |   |
| Business Acquisition, Percentage of Voting Interests Acquired                                                                            |            |    |    |    |   | 50.00% |            |   |   |   |            |   |   | 50.00%  |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net                                                |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    |   | 23 |   |   |   |
| Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized                                                                   |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    |   | 23 |   |   |   |
| Acquired Finite-lived Intangible Asset, Amount                                                                                           |            |    |    |    |   |   |            |   |   |   | 45              |   |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (years)                                                             |            |    |    |    |   |   |            |   |   | 9      |            |   |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Cost of Acquired Entity, Cash Paid                                                                                 |            |    |    |    |   |   |            |   |   |   |            |   | 50     |    |            |   | 18     |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Cost of Acquired Entity, Liabilities Incurred                                                                      |            |    |    |    |   |   |            |   |   |   |            |   | 5      |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Extraordinary Item, Gain (Loss), Net of Tax, Attributable to Parent                                                                      | 0               | 0       | 23      |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    | 23     |   |   |   |   |
| Business Acquisition, Purchase Price Allocation, Current Assets, Inventory                                                               |            |    |    |    |   |   |            |   |   |   |            | 73     |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets                                                                 |            |    |    |    |   |   |            |   |   |   |            | 1      |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Purchase Price Allocation, Current Liabilities, Other Liabilities                                                  |            |    |    |    |   |   |            |   |   |   |            | 1      |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage                                                  |            |    |    |    |   |   |            |   |   |   |            |   |   | 100.00% |            |   |   |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Cost of Acquired Entity, Purchase Price                                                                            |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   | 20     |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Purchase Price Allocation, Preacquisition Contingency Accrual                                                      |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   | 2      |   |            |           |                |    |   |   |   |   |   |
| Business Acquisition, Preacquisition Contingency, Amount                                                                                 |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   | 16     | 25              |           |                |    |   |   |   |   |   |
| Business Acquisition, Preacquisition Contingency, Amount of Settlement                                                                   |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   | 9      |            |           |                |    |   |   |   |   |   |
| Goodwill, Purchase Accounting Adjustments                                                                                                |            |    |    |    |   |   |            |   |   |   |            |   |   |    |            |   |   | (7)    |            |           |                |    |   |   |   |   |   |
| Costs of products sold                                                                                                                   | $ 11,262        | $ 9,741 | $ 9,366 |    |   |   |            |   |   |   |            |   |   |    |            |   |   | $ 2    |            |           |                |    |   |   |   |   |   |
| Number of Dealcors                                                                                                                       | 4               | 3       | 4       |    |   |   |            |   |   |   |            |   |   |    |            |   |   |   |            |           |                |    |   |   |   |   |   |
|                                                                                                                                          |
| [1]Amounts include the borrowing of $100 million under the Asset-Based Credit Facility in November 2011, reflected as being due in 2017. |

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| - Definition
The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.
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| - Definition
The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.
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| - Definition
Amount of cash paid to acquire the entity.
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| - Definition
Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.
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| - Definition
The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.
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| - Definition
Percentage of voting equity interests acquired in the business combination.
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| - Definition
Amount assigned in the purchase price allocation to the preacquisition contingency.
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Amount paid or received to resolve the preacquisition contingency.
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| - Definition
Income (expense) and gain (loss) recognized from the settlement of a preexisting relationship between the acquirer and the acquiree.
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| - Definition
The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials.
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The amount of acquisition cost of a business combination allocated to other current liabilities of the acquired entity. Does not include amounts allocated to the current portion of long-term debt, accounts payable and accrued expenses.
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| - Definition
The amount of acquisition cost of a business combination allocated to noncurrent assets of the acquired entity, except for property plant and equipment, intangible assets, and goodwill.
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| - Definition
The amount of acquisition cost of a business combination allocated to preacquisition contingencies other than contingencies associated with income taxes.
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| - Definition
The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total costs related to goods produced and sold during the reporting period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the gains or losses, after tax, arising from an event or transaction that is both unusual in nature and infrequent in occurrence when considered in relation to the environment in which the entity operates and which represents the parent's portion. This amount is the income statement amount which is allocable to the parent.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).
+ References
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