Segment Information (Reconciliation Of Total Revenues To Sales And Other Operating Revenues) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues (as reported above)	$ 21,050	$ 20,616	$ 61,560	$ 59,218
Plus: Corporate and other unallocated items	(1)		(3)
Less: Sales to related parties	2	2	6	53
Sales and other operating revenues (including consumer excise taxes)	$ 21,047	$ 20,614	$ 61,551	$ 59,165