Earnings From Equity Investment In SABMiller (Equity Method Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity earnings	$ 199	$ 508
Gains resulting from issuances of common stock by SABMiller	57	12
Earnings from equity investment in SABMiller	$ 256	$ 520

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.

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