Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 15,377
Other comprehensive losses before reclassifications	(81)	$ (296)
Deferred income taxes	16	104
Other comprehensive losses before reclassifications, net of deferred income taxes	(65)	(192)
Amounts reclassified to net earnings	48	54
Deferred income taxes	(13)	(22)
Amounts reclassified to net earnings, net of deferred income taxes	35	32
Other comprehensive earnings (losses), net of deferred income taxes	(30)	(160)	$ 155
Ending balance	15,394		15,377
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,839)	(2,048)	(2,048)
Other comprehensive losses before reclassifications	0	0
Deferred income taxes	0	0
Other comprehensive losses before reclassifications, net of deferred income taxes	0	0
Amounts reclassified to net earnings	61	54
Deferred income taxes	(16)	(22)
Amounts reclassified to net earnings, net of deferred income taxes	45	32
Other comprehensive earnings (losses), net of deferred income taxes	45	32
Ending balance	(1,794)	(2,016)	(1,839)
AB InBev [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(54)	0	0
Other comprehensive losses before reclassifications	(81)	(296)
Deferred income taxes	16	104
Other comprehensive losses before reclassifications, net of deferred income taxes	(65)	(192)
Amounts reclassified to net earnings	(13)	0
Deferred income taxes	3	0
Amounts reclassified to net earnings, net of deferred income taxes	(10)	0
Other comprehensive earnings (losses), net of deferred income taxes	(75)	(192)
Ending balance	(129)	(192)	(54)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(4)	(4)	(4)
Other comprehensive losses before reclassifications	0	0
Deferred income taxes	0	0
Other comprehensive losses before reclassifications, net of deferred income taxes	0	0
Amounts reclassified to net earnings	0	0
Deferred income taxes	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0
Other comprehensive earnings (losses), net of deferred income taxes	0	0
Ending balance	(4)	(4)	(4)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,897)	(2,052)	(2,052)
Other comprehensive earnings (losses), net of deferred income taxes	(30)		155
Ending balance	$ (1,927)	$ (2,212)	$ (1,897)