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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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