Applicable Income Taxes Included in the Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation Of Provision Of Income Taxes [Line Items]
U.S. Federal income taxes	$ 82	$ (5)	$ (157)
State and local income taxes	14	16	6
Foreign income taxes			(3)
Total current tax (benefit) expense	96	11	(154)
U.S. Federal income taxes	411	165	190
State and local income taxes	26	11	(8)
Foreign income taxes			2
Total deferred tax expense (benefit)	437	176	184
Applicable income tax expense	$ 533	$ 187	$ 30