Other Comprehensive Earnings/Losses (Changes In Each Component Of Accumulated Other Comprehensive Losses) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Other Comprehensive Earnings/Losses by Component [Line Items]
Balances at beginning of period	$ (1,887)	$ (1,484)
Period change	213	(403)
Balances at end of Period	(1,674)	(1,887)
Currency Translation Adjustments [Member]
Other Comprehensive Earnings/Losses by Component [Line Items]
Balances at beginning of period	2	4
Period change	0	(2)
Balances at end of Period	2	2
Benefit Plans [Member]
Other Comprehensive Earnings/Losses by Component [Line Items]
Balances at beginning of period	(2,062)	(1,811)
Period change	61	(251)
Balances at end of Period	(2,001)	(2,062)
SABMiller [Member]
Other Comprehensive Earnings/Losses by Component [Line Items]
Balances at beginning of period	173	323
Period change	152	(150)
Balances at end of Period	$ 325	$ 173