Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			$ 15,377
Other comprehensive (losses) earnings before reclassifications	$ (512)	$ (216)	(289)	$ 10
Deferred income taxes	107	75	57	(3)
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	(405)	(141)	(232)	7
Amounts reclassified to net earnings	29	51	127	159
Deferred income taxes	(6)	(18)	(32)	(60)
Amounts reclassified to net earnings, net of deferred income taxes	23	33	95	99
Other comprehensive (losses) earnings, net of deferred income taxes	(382)	(108)	(137)	106	$ 155
Ending balance	15,494		15,494		15,377
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,752)	(1,983)	(1,839)	(2,048)	(2,048)
Other comprehensive (losses) earnings before reclassifications	0	0	0	0
Deferred income taxes	0	0	0	0
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	0	0	0	0
Amounts reclassified to net earnings	50	48	168	154
Deferred income taxes	(11)	(17)	(42)	(58)
Amounts reclassified to net earnings, net of deferred income taxes	39	31	126	96
Other comprehensive (losses) earnings, net of deferred income taxes	39	31	126	96
Ending balance	(1,713)	(1,952)	(1,713)	(1,952)	(1,839)
AB InBev [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	106	148	(54)	0	0
Other comprehensive (losses) earnings before reclassifications	(513)	(216)	(288)	9
Deferred income taxes	107	75	57	(3)
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	(406)	(141)	(231)	6
Amounts reclassified to net earnings	(21)	3	(41)	5
Deferred income taxes	5	(1)	10	(2)
Amounts reclassified to net earnings, net of deferred income taxes	(16)	2	(31)	3
Other comprehensive (losses) earnings, net of deferred income taxes	(422)	(139)	(262)	9
Ending balance	(316)	9	(316)	9	(54)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(6)	(3)	(4)	(4)	(4)
Other comprehensive (losses) earnings before reclassifications	1	0	(1)	1
Deferred income taxes	0	0	0	0
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	1	0	(1)	1
Amounts reclassified to net earnings	0	0	0	0
Deferred income taxes	0	0	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0	0	0
Other comprehensive (losses) earnings, net of deferred income taxes	1	0	(1)	1
Ending balance	(5)	(3)	(5)	(3)	(4)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,652)	(1,838)	(1,897)	(2,052)	(2,052)
Other comprehensive (losses) earnings, net of deferred income taxes			(137)		155
Ending balance	$ (2,034)	$ (1,946)	$ (2,034)	$ (1,946)	$ (1,897)