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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			$ 2,880
Other comprehensive earnings (losses) before reclassifications	$ 48	$ (496)	(159)	$ (931)
Other comprehensive earnings (losses) before reclassifications, deferred income taxes	(17)	174	66	325
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	31	(322)	(93)	(606)
Amounts reclassified to net earnings	47	69	151	212
Amounts reclassified to net earnings, deferred income taxes	(16)	(26)	(56)	(81)
Amounts reclassified to net earnings, net of deferred income taxes	31	43	95	131
Other comprehensive earnings (losses), net of deferred income taxes	62	(279)	2	(475)	$ (598)
Ending balance	2,944		2,944		2,880
SABMiller [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive earnings (losses) before reclassifications	48	(493)	158	(927)
Other comprehensive earnings (losses) before reclassifications, deferred income taxes	(17)	173	(56)	324
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	31	(320)	102	(603)
Amounts reclassified to net earnings	5	5	24	14
Amounts reclassified to net earnings, deferred income taxes	(2)	(2)	(9)	(4)
Amounts reclassified to net earnings, net of deferred income taxes	3	3	15	10
Other comprehensive earnings (losses), net of deferred income taxes	34	(317)	117	(593)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(4)	(3)	(5)	(2)	(2)
Other comprehensive earnings (losses) before reclassifications	0	(3)	1	(4)
Other comprehensive earnings (losses) before reclassifications, deferred income taxes	0	1	0	1
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	(2)	1	(3)
Amounts reclassified to net earnings	0	0	0	0
Amounts reclassified to net earnings, deferred income taxes	0	0	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0	0	0
Other comprehensive earnings (losses), net of deferred income taxes	0	(2)	1	(3)
Ending balance	(4)	(5)	(4)	(5)	(5)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,154)	(1,959)	(2,010)	(2,040)	(2,040)
Other comprehensive earnings (losses) before reclassifications	0	0	(318)	0
Other comprehensive earnings (losses) before reclassifications, deferred income taxes	0	0	122	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	0	(196)	0
Amounts reclassified to net earnings	42	64	127	198
Amounts reclassified to net earnings, deferred income taxes	(14)	(24)	(47)	(77)
Amounts reclassified to net earnings, net of deferred income taxes	28	40	80	121
Other comprehensive earnings (losses), net of deferred income taxes	28	40	(116)	121
Ending balance	(2,126)	(1,919)	(2,126)	(1,919)	(2,010)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(3,340)	(2,878)	(3,280)	(2,682)	(2,682)
Other comprehensive earnings (losses), net of deferred income taxes			2		(598)
Ending balance	(3,278)	(3,157)	(3,278)	(3,157)	(3,280)
AOCI Attributable to Parent [Member] | SABMiller [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,182)	(916)	(1,265)	(640)	(640)
Ending balance	$ (1,148)	$ (1,233)	$ (1,148)	$ (1,233)	$ (1,265)