Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 12,770
Other comprehensive earnings (losses) before reclassifications	(39)	$ 541	$ (1,210)
Deferred income taxes	11	(180)	431
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(28)	361	(779)
Amounts reclassified to net earnings	299	1,338	293
Deferred income taxes	(116)	(471)	(112)
Amounts reclassified to net earnings, net of deferred income taxes	183	867	181
Other comprehensive (losses) earnings, net of deferred income taxes	155	1,228	(598)
Ending balance	15,377	12,770
Accumulated other comprehensive losses	1,897	2,052
AB InBev and SABMiller [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive losses		414
Currency translations		97
SABMiller Plc [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive losses		737
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,048)	(2,010)	(2,040)
Other comprehensive earnings (losses) before reclassifications	52	(247)	(223)
Deferred income taxes	(21)	96	86
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	31	(151)	(137)
Amounts reclassified to net earnings	291	178	272
Deferred income taxes	(113)	(65)	(105)
Amounts reclassified to net earnings, net of deferred income taxes	178	113	167
Other comprehensive (losses) earnings, net of deferred income taxes	209	(38)	30
Ending balance	(1,839)	(2,048)	(2,010)
Accumulated Equity Method Investments Attributable To Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	0	(1,265)	(640)
Other comprehensive earnings (losses) before reclassifications	(91)	787	(983)
Deferred income taxes	32	(276)	344
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(59)	511	(639)
Amounts reclassified to net earnings	8	1,160	21
Deferred income taxes	(3)	(406)	(7)
Amounts reclassified to net earnings, net of deferred income taxes	5	754	14
Other comprehensive (losses) earnings, net of deferred income taxes	(54)	1,265	(625)
Ending balance	(54)	0	(1,265)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(4)	(5)	(2)
Other comprehensive earnings (losses) before reclassifications	0	1	(4)
Deferred income taxes	0	0	1
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	1	(3)
Amounts reclassified to net earnings	0	0	0
Deferred income taxes	0	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0	0
Other comprehensive (losses) earnings, net of deferred income taxes	0	1	(3)
Ending balance	(4)	(4)	(5)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,052)	(3,280)	(2,682)
Other comprehensive (losses) earnings, net of deferred income taxes	155	1,228	(598)
Ending balance	$ (1,897)	$ (2,052)	$ (3,280)