Components of the Provision for Income Taxes, Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current taxes:
U.S. and state																	$ 103	$ 311	$ 149
International																	52	37	23
Current taxes																	155	348	172
Deferred taxes:
U.S. and state																	157	1	89
International																	(21)	3	(8)
Deferred taxes																	136	4	81
Provision for income taxes, net	$ 86	[1]	$ 67	[1]	$ 49	[1]	$ 89	[1]	$ 84	[1]	$ 79	[1]	$ 88	[1]	$ 100	[1]	$ 291	$ 352	$ 253

[1] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.