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Earnings from Equity Investment in SABMiller (Equity Method Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]
Earnings from equity investment in SABMiller	$ 255	$ 230	$ 738	$ 973
SABMiller [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings	243	216	662	942
Gains resulting from issuances of common stock by SABMiller	12	14	76	31
Earnings from equity investment in SABMiller	$ 255	$ 230	$ 738	$ 973

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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