Applicable Income Taxes Included in the Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation Of Provision Of Income Taxes [Abstract]
U.S. Federal income taxes	$ 494	$ 327	$ 82
State and local income taxes	23	38	14
Foreign income taxes	2
Total current tax (benefit) expense	519	365	96
U.S. Federal income taxes	232	252	411
State and local income taxes	23	19	26
Foreign income taxes	(2)
Total deferred tax expense (benefit)	253	271	437
Applicable income tax expense	$ 772	$ 636	$ 533