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Investment in SABMiller (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Nov. 11, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Earnings from equity investment in SABMiller | $ 757 | $ 1,006 | $ 991 |
SABMiller Plc [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage (approximately) |  |  |  | 27.00%
Undistributed earnings from equity method investment | 3,200 |  |  |
SABMiller Plc [Member] | Reported Value Measurement [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment in SABMiller | 5,500 | 6,200 |  |
SABMiller Plc [Member] | Level 1 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment in SABMiller | $ 25,800 | $ 22,500 |  |

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