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Investment in SABMiller/AB InBev (Details) £ / shares in Units, £ in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 24, 2016 USD ($) shares | Oct. 10, 2016 USD ($) shares | Oct. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Oct. 10, 2016 £ / shares shares | Aug. 31, 2016 GBP (£) | Aug. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2015 GBP (£) | Nov. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lock-up period |  |  |  |  |  | 5 years |  |  |  |  |  |
Foreign Exchange Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of option |  |  |  |  |  |  |  | £ 378 | $ 480 |  | £ 1,625 | $ 2,467
Pre-tax gain on change in fair value of option |  |  |  |  | $ 48 | $ 205 |  |  |  |  |  |
Foreign Exchange Option [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair values of options |  |  |  |  | $ 360 | $ 360 |  |  |  | $ 152 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of derivative financial instruments |  |  | $ 500 |  |  |  |  |  |  |  |  |
Pre-tax cash received from Transaction |  | $ 5,300 |  |  |  |  |  |  |  |  |  |
AB InBev [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
British pounds in cash for each SABMiller share offered by AB InBev (GBP per share) | £ / shares |  |  |  |  |  |  | £ 45 |  |  |  |  |
Partial share alternative percentage available for SABMiller shares (approximately) |  |  |  |  |  |  | 41.00% |  |  |  |  |
Pre-tax gain (estimated) |  | 13,700 |  |  |  |  |  |  |  |  |  |
After-tax gain (estimated) |  | 8,900 |  |  |  |  |  |  |  |  |  |
SABMiller [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  |  |  |  | 27.00% | 27.00% |  |  |  |  |  |
SABMiller [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares owned/shares purchased (in shares) | shares |  |  |  |  |  |  | 430,000,000 |  |  |  |  |
AB InBev [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) | 10.20% |  |  |  |  |  | 9.60% |  |  |  |  |
Shares owned/shares purchased (in shares) | shares | 12,341,937 |  |  |  |  |  |  |  |  |  |  |
Cash component of the PSA (taking into account proration) |  | $ 4,800 |  |  |  |  |  |  |  |  |  |
Total cost of AB InBev shares purchased | $ 1,600 |  |  |  |  |  |  |  |  |  |  |
AB InBev [Member] | Subsequent Event [Member] | Restricted Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares in AB InBev (in shares) | shares |  | 185,115,417 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] | Foreign Exchange Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on change in fair value of option |  |  |  | $ 145 |  |  |  |  |  |  |  |

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