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Investment in SABMiller (Narrative) (Details) (SABMiller Plc [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Reported Value Measurement [Member]
Dec. 31, 2012
Reported Value Measurement [Member]
Dec. 31, 2013
Level 1 [Member]
Estimate of Fair Value Measurement [Member]
Dec. 31, 2012
Level 1 [Member]
Estimate of Fair Value Measurement [Member]
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 26.80%        
Gains included in Earnings From Equity Method Investment $ 342,000,000        
Fair value of investment in SABMiller   6,500,000,000 6,600,000,000 22,100,000,000 19,800,000,000
Undistributed earnings from equity method investment $ 2,700,000,000