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Background and Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 33 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2018 | Jul. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016 | Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, increase (decrease) in dividend rate, percentage |  | 6.10% |  |  |  |  |  |  |  |
Dividends declared (usd per share) |  | $ 0.70 | $ 0.66 | $ 0.61 | $ 2.54 |  |  |  |  |
Annualized dividend rate |  | $ 2.8 |  |  |  |  |  |  |  |
Repurchase of common stock (shares) |  | 8.0 |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased |  | $ 513,000,000 |  |  | $ 2,917,000,000 |  |  |  |  |
Average price of repurchased shares, per share (usd per share) |  | $ 64.33 |  |  |  |  |  |  |  |
Net periodic benefit income, excluding service cost |  | $ (7,000,000) |  | $ (8,000,000) |  |  |  |  |  |
AB InBev [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  | 10.20% |  |  |  | 10.20% |  |  |  |
July 2015 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  | $ 4,000,000,000 |  | $ 3,000,000,000 | $ 1,000,000,000
Repurchase of common stock (shares) | 0.3 |  |  | 7.7 |  | 58.7 |  |  |  |
Aggregate cost of shares repurchased | $ 18,000,000 |  |  | $ 551,000,000 |  |  |  |  |  |
Average price of repurchased shares, per share (usd per share) | $ 71.68 |  |  | $ 71.77 |  | $ 68.15 |  |  |  |
January 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Planned share repurchase program | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Repurchase of common stock (shares) |  | 7.7 |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased |  | $ 495,000,000 |  |  |  |  |  |  |  |
Average price of repurchased shares, per share (usd per share) |  | $ 64.08 |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 505,000,000 |  |  |  | $ 505,000,000 |  |  |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ 98,000,000 | $ 61,000,000 | $ 92,000,000 | $ 61,000,000 | $ 98,000,000 |  | $ 82,000,000 |  |
Cost of Sales [Member] | Account Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Net periodic benefit income, excluding service cost |  |  |  | (3,000,000) |  |  |  |  |  |
Marketing, Adminstration and Research Costs [Member] | Account Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Net periodic benefit income, excluding service cost |  |  |  | $ (5,000,000) |  |  |  |  |  |

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