Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 01, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		$ 15,377
Adoption of ASU No. 2018-02		(397)			$ 408	$ 0	[1]
Other comprehensive (losses) earnings before reclassifications		(475)	$ (39)	$ 541
Deferred income taxes		103	11	(180)
Other comprehensive losses before reclassifications, net of deferred income taxes		(372)	(28)	361
Amounts reclassified to net earnings		177	299	1,338
Deferred income taxes		(47)	(116)	(471)
Amounts reclassified to net earnings, net of deferred income taxes		130	183	867
Other comprehensive (losses) earnings, net of deferred income taxes		(242)	155	1,228
Ending balance		14,787	15,377
Accumulated other comprehensive losses		2,547	1,897
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		(1,839)	(2,048)	(2,010)
Other comprehensive (losses) earnings before reclassifications		(151)	52	(247)
Deferred income taxes		39	(21)	96
Other comprehensive losses before reclassifications, net of deferred income taxes		(112)	31	(151)
Amounts reclassified to net earnings		241	291	178
Deferred income taxes		(61)	(113)	(65)
Amounts reclassified to net earnings, net of deferred income taxes		180	178	113
Other comprehensive (losses) earnings, net of deferred income taxes		68	209	(38)
Ending balance		(2,168)	(1,839)	(2,048)
Accumulated Equity Method Investments Attributable To Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(54)	0	(1,265)
Other comprehensive (losses) earnings before reclassifications		(323)	(91)	787
Deferred income taxes		64	32	(276)
Other comprehensive losses before reclassifications, net of deferred income taxes		(259)	(59)	511
Amounts reclassified to net earnings		(64)	8	1,160
Deferred income taxes		14	(3)	(406)
Amounts reclassified to net earnings, net of deferred income taxes		(50)	5	754
Other comprehensive (losses) earnings, net of deferred income taxes		(309)	(54)	1,265
Ending balance		(374)	(54)	0
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(4)	(4)	(5)
Other comprehensive (losses) earnings before reclassifications		(1)	0	1
Deferred income taxes		0	0	0
Other comprehensive losses before reclassifications, net of deferred income taxes		(1)	0	1
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		(1)	0	1
Ending balance		(5)	(4)	(4)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(1,897)	(2,052)	(3,280)
Adoption of ASU No. 2018-02	[1]					(408)
Other comprehensive (losses) earnings, net of deferred income taxes		(242)	155	1,228
Ending balance		$ (2,547)	$ (1,897)	$ (2,052)
Accounting Standards Update 2018-02 [Member] | Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Adoption of ASU No. 2018-02						(397)
Accounting Standards Update 2018-02 [Member] | Accumulated Equity Method Investments Attributable To Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Adoption of ASU No. 2018-02						(11)
Accounting Standards Update 2018-02 [Member] | Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Adoption of ASU No. 2018-02						0
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Adoption of ASU No. 2018-02						$ (408)

[1] For further discussion, see Note 15. Income Taxes.