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Background and Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 31 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jan. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 31, 2018 | Oct. 25, 2018 | May 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 |  |  | 14.30% | 6.10% |  | 21.20% |  |  |  |  |  |  |  |  |
Dividends declared (usd per share) | $ 0.66 |  | $ 0.8 | $ 0.7 |  | $ 2.20 | $ 1.88 | $ 2.54 |  |  |  |  |  |  |
Annualized dividend rate (usd per share) |  |  |  |  |  | $ 3.20 |  |  |  |  |  |  |  |  |
Repurchase of common stock (shares) |  |  | 6.2 |  | 11.1 | 21.8 | 33.2 |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased |  |  | $ 367,000,000 |  | $ 759,000,000 | $ 1,317,000,000 | $ 2,359,000,000 | $ 2,917,000,000 |  |  |  |  |  |  |
Average price of repurchased shares, per share (usd per share) |  |  | $ 59.18 |  | $ 67.99 | $ 60.53 | $ 70.97 |  |  |  |  |  |  |  |
Net periodic benefit income, excluding service cost |  |  | $ 21,000,000 |  | $ 18,000,000 | $ 37,000,000 | $ 37,000,000 |  |  |  |  |  |  |  |
AB InBev [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of equity investment | $ 22,100,000,000 |  | $ 17,200,000,000 |  |  | $ 17,200,000,000 |  | 22,100,000,000 |  |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  |  | 10.10% |  |  | 10.10% |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 58.7 |  |  |  |  |  |
Average price of repurchased shares, per share (usd per share) |  | $ 71.68 |  |  |  |  |  |  | $ 68.15 |  |  |  |  |  |
January 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  | $ 1,000,000,000 |  |  |  |  |  |  | $ 1,000,000,000 |  | $ 2,000,000,000 |  |  |  |
Repurchase of common stock (shares) |  |  | 6.2 |  |  | 21.5 |  |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased |  |  | $ 367,000,000 |  |  | $ 1,299,000,000 |  |  |  |  |  |  |  |  |
Average price of repurchased shares, per share (usd per share) |  |  | $ 59.18 |  |  | $ 60.40 |  |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 700,000,000 |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 61,000,000 |  | $ 99,000,000 |  | 61,000,000 | $ 99,000,000 | 61,000,000 | $ 61,000,000 |  |  |  |  | $ 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 |  |  |  |  | 12,000,000 |  | 20,000,000 |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 6,000,000 |  | $ 17,000,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | AB InBev [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of equity investment |  |  |  |  |  |  |  |  |  | $ 14,500,000,000 |  |  |  |  |

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