Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 14,789	$ 15,380
Other comprehensive losses, net of deferred income taxes	(170)	(30)
Ending balance	14,081	15,397
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,168)	(1,839)
Other comprehensive (losses) earnings before reclassifications	0	0
Deferred income taxes	0	0
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	0	0
Amounts reclassified to net earnings	39	61
Deferred income taxes	(10)	(16)
Amounts reclassified to net earnings, net of deferred income taxes	29	45
Other comprehensive losses, net of deferred income taxes	29	45
Ending balance	(2,139)	(1,794)
AB InBev [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(374)	(54)
Other comprehensive (losses) earnings before reclassifications	(238)	(81)
Deferred income taxes	49	16
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	(189)	(65)
Amounts reclassified to net earnings	(12)	(13)
Deferred income taxes	2	3
Amounts reclassified to net earnings, net of deferred income taxes	(10)	(10)
Other comprehensive losses, net of deferred income taxes	(199)	(75)
Ending balance	(573)	(129)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(5)	(4)
Other comprehensive (losses) earnings before reclassifications	0	0
Deferred income taxes	0	0
Other comprehensive (losses) earnings 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 losses, net of deferred income taxes	0	0
Ending balance	(5)	(4)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,547)	(1,897)
Other comprehensive (losses) earnings before reclassifications	(238)	(81)
Deferred income taxes	49	16
Other comprehensive (losses) earnings before reclassifications, net of deferred income taxes	(189)	(65)
Amounts reclassified to net earnings	27	48
Deferred income taxes	(8)	(13)
Amounts reclassified to net earnings, net of deferred income taxes	19	35
Other comprehensive losses, net of deferred income taxes	(170)	(30)
Ending balance	$ (2,717)	$ (1,927)