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Investment in SABMiller (Narrative) (Details) £ / shares in Units, £ in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2016 USD ($) shares | Jun. 30, 2016 USD ($) | Nov. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jul. 26, 2016 £ / shares | Dec. 31, 2015 USD ($) | Nov. 30, 2015 GBP (£) £ / shares | Nov. 30, 2015 USD ($)
Foreign Exchange Option [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of option |  |  |  |  |  |  |  | £ 1,625 | $ 2,467
Pre-tax gain on change in fair value of option |  |  |  | $ 117 | $ 157 |  |  |  |
Foreign Exchange Option [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of option |  | $ 309 |  | $ 309 | $ 309 |  | $ 152 |  |
AB InBev and SABMiller [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration to be transferred by AB InBev (approximately) |  |  | $ 107,000 |  |  |  |  |  |
British pounds in cash for each SABMiller share offered by AB InBev (GBP per share) | £ / shares |  |  |  |  |  |  |  | £ 44 |
Partial share alternative percentage available for SABMiller shares (approximately) |  |  |  |  |  |  |  | 41.00% | 41.00%
Partial share alternative, GBP in cash (GBP per share) | £ / shares |  |  |  |  |  |  |  | £ 3.7788 |
Pre-tax accounting gain (approximately) |  | 13,000 |  |  |  |  |  |  |
After-tax accounting gain (approximately) |  | $ 8,500 |  |  |  |  |  |  |
AB InBev and SABMiller [Member] | Foreign Exchange Option [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Expected pre-tax cash consideration expected to be received (subject to proration) |  |  |  |  |  |  |  |  | $ 2,500
AB InBev and SABMiller [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, GBP in cash (GBP per share) | £ / shares |  |  |  |  |  | £ 4.6588 |  |  |
Expected pre-tax cash received (subject to proration) | $ 3,000 |  |  |  |  |  |  |  |
Partial share alternative, increase in GBP cash | $ 500 |  |  |  |  |  |  |  |
AB InBev and SABMiller [Member] | Subsequent Event [Member] | Restricted Shares [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Partial share alternative, new shares receivable per previously owned share (in shares) | shares | 0.483969 |  |  |  |  |  |  |  |
Expected economic and voting interests percentage | 10.50% |  |  |  |  |  |  |  |
SABMiller Plc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  | 27.00% |  | 27.00% | 27.00% |  |  |  |
SABMiller Plc [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (approximately) | 27.00% |  |  |  |  |  |  |  |

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