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Background and Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2015 | Jul. 31, 2015 | Jul. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock, shares | 2.8 | 3.6 |  |  |  |
Average price of repurchased shares, per share | $ 59.81 | $ 53.03 |  |  |  |
Accounting Standards Update 2015-03 [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Debt issuance costs | $ 70,000,000 |  |  | $ 72,000,000 |  |
July 2014 Share Repurchase Program [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  | $ 1,000,000,000
Repurchase of common stock, shares |  |  | 20.4 |  |  |
Average price of repurchased shares, per share |  |  | $ 48.90 |  |  |
July 2015 Share Repurchase Program [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Planned share repurchase program |  |  |  |  | $ 1,000,000,000.0 |
Remaining authorized repurchase amount | $ 797,000,000 |  |  |  |  |
SABMiller Plc [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) | 27.00% |  |  |  |  |

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