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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%