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Investment in SABMiller (Narrative) (Details) £ / shares in Units, £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2015 USD ($) shares | Mar. 31, 2016 USD ($) | 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 |  | $ 40 |  |  |
Fair value of option |  | $ 192 | $ 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 |
Expected pre-tax cash received (subject to proration) |  |  |  |  | $ 2,500
Pre-tax accounting gain (approximately) | 12,000 |  |  |  |
After-tax accounting gain (approximately) | $ 8,000 |  |  |  |
AB InBev and SABMiller [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% | 10.50%
SABMiller Plc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity method investment, ownership percentage (approximately) |  | 27.00% |  |  |

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