Accumulated Other Comprehensive Losses (Changes In Component Of Accumulated Other Comprehensive Losses) (Details) (USD $) In Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Balances at end of period	$ (1,461)	$ (1,484)
Currency Translation Adjustments [Member]
Balances at beginning of period	4	3
Period Change	(1)	1
Balances at end of period	3	4
Changes In Net Loss And Prior Service Cost [Member]
Balances at beginning of period	(1,811)	(1,846)
Period Change	100	35
Balances at end of period	(1,711)	(1,811)
Ownership Share Of SABMiller's Other Comprehensive Earnings (Losses) [Member]
Balances at beginning of period	323	282
Period Change	(76)	41
Balances at end of period	247	323
Accumulated Other Comprehensive Losses [Member]
Balances at beginning of period	(1,484)	(1,561)
Period Change	23	77
Balances at end of period	$ (1,461)	$ (1,484)