Other Comprehensive Earnings/Losses (Changes In Each Component Of Accumulated Other Comprehensive Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Other Comprehensive Earnings Losses By Component [Line Items]
Balances at beginning of period	$ (2,040)	$ (1,887)	$ (1,887)
Other Comprehensive Income Loss Before reclassifications Before tax	(113)	273
Deferred Income Taxes	37	(96)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(76)	177
Amounts reclassified to earnings	77	41
Deferred income taxes	(29)	(16)
Amounts reclassified to net earnings, net of deferred income taxes	48	25
Other comprehensive earnings, net of deferred income taxes	(28)	202	(153)
Balances at end of Period	(2,068)	(1,685)	(2,040)
Accumulated Translation Adjustment [Member]
Other Comprehensive Earnings Losses By Component [Line Items]
Balances at beginning of period	2	2	2
Other Comprehensive Income Loss Before reclassifications Before tax	0	0
Deferred Income Taxes	0	0
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	0	0
Amounts reclassified to earnings	0	0
Deferred income taxes	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0
Other comprehensive earnings, net of deferred income taxes	0	0
Balances at end of Period	2	2
Accumulated Defined Benefit Plans Adjustment [Member]
Other Comprehensive Earnings Losses By Component [Line Items]
Balances at beginning of period	(2,414)	(2,062)	(2,062)
Other Comprehensive Income Loss Before reclassifications Before tax	30	0
Deferred Income Taxes	(13)	0
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	17	0
Amounts reclassified to earnings	79	37
Deferred income taxes	(30)	(15)
Amounts reclassified to net earnings, net of deferred income taxes	49	22
Other comprehensive earnings, net of deferred income taxes	66	22
Balances at end of Period	(2,348)	(2,040)
SABMiller [Member]
Other Comprehensive Earnings Losses By Component [Line Items]
Balances at beginning of period	372	173	173
Other Comprehensive Income Loss Before reclassifications Before tax	(143)	273
Deferred Income Taxes	50	(96)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(93)	177
Amounts reclassified to earnings	(2)	4
Deferred income taxes	1	(1)
Amounts reclassified to net earnings, net of deferred income taxes	(1)	3
Other comprehensive earnings, net of deferred income taxes	(94)	180
Balances at end of Period	$ 278	$ 353