Description of Business and Significant Accounting Policies - Out of Period Adjustments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Misapplication of Accounting Guidance Related to Recognition of Income Tax Expense [Member]	Dec. 31, 2011 Inter-company Transactions Included in Cumulative Translation Adjustment [Member]	Dec. 31, 2011 Brazil Tax Accounts Determined to be Unrecoverable [Member]
Income tax benefit	$ (223)	$ 66	$ (5)	$ 5
Charges in other income and expense related to foreign currency fluctuations					2
Increase in selling, general and administrative expenses to correct tax accounts in Brazil determined to be unrecoverable						$ 4

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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