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Background and Basis of Presentation (Narrative) (Details) - USD ($) shares in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Jul. 31, 2015
SABMiller [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  |  |  |  | 27.00% |
AB InBev [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  | 10.20% | 10.20% | 9.60% |  |
Pre-tax gain on change in fair value of derivative financial instrument | $ 40,000,000 |  |  |  |  |
Shares owned/shares purchased (in shares) (approximately) |  |  | 12 |  |  |
July 2015 Share Repurchase Program [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Planned share repurchase program |  |  |  | $ 3,000,000,000 |  | $ 1,000,000,000
Remaining authorized repurchase amount |  | $ 1,384,000,000 |  |  |  |

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