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Earnings from Equity Investment in SABMiller (Equity Method Investments) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Earnings from equity investment in SABMiller $ 225 $ 256
SABMiller Plc [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity earnings 214 199
Gains resulting from issuances of common stock by SABMiller 11 57
Earnings from equity investment in SABMiller $ 225 $ 256