Investment In SABMiller (Equity Method Investments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings (Losses) of Noncontrolling Interest and Equity Method Investments [Abstract]
Equity earnings	$ 1,181	$ 703	$ 578
Gains resulting from issuances of common stock by SABMiller	43	27	50
Earnings from equity investment in SABMiller	$ 1,224	$ 730	$ 628

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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