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Investment in AB InBev/SABMiller (Summary of Balance Sheet of SABMiller and AB InBev) (Details) - AB InBev [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Oct. 10, 2016
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Difference between carrying amount and underlying equity | $ 11,700 |  |  |
Current assets |  | $ 30,920 |  | $ 40,086
Long-term assets |  | 213,696 |  | 223,701
Current liabilities |  | 37,765 |  | 44,272
Long-term liabilities |  | 134,236 |  | 139,112
Noncontrolling interests |  | $ 10,639 |  | $ 9,177
Estimate of Fair Value Measurement [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment | 22,100 |  | $ 20,900 |
Reported Value Measurement [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value of investment | $ 18,000 |  | $ 17,900 |

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