Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), before Tax, beginning balance	$ (506)	$ (2,744)		$ (2,531)
Unrealized net gain on securities	(944)	198		653
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax	(2)	(2,279)	[1]	(117)	[1]
Unrealized net gain on derivatives	16	81		684
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	(417)	(143)		(625)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	399	(95)		(382)
Accumulated Other Comprehensive Income (Loss), before Tax, ending balance	442	(506)		(2,744)
Accumulated Other Comprehensive Income Loss Tax [Abstract]
AOCI, beginning balance	(197)	(995)		(915)
Unrealized net gain on securities	348	(72)		(242)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	1	810	[1]	43	[1]
Unrealized net gain on derivatives	(6)	(28)		(253)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax	154	53		231
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	(147)	35		141
AOCI, ending balance	153	(197)		(995)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
AOCI, beginning balance	309	1,749		1,616
Unrealized net gain on securities	(596)	126		411
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(1)	(1,469)	[1]	(74)	[1]
Unrealized net gain on derivatives	10	53		431
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(263)	(90)		(394)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	252	(60)		(241)
AOCI, ending balance	$ (289)	$ 309		$ 1,749

[1] Excludes $305 million of losses related to derivatives associated with the Coke Agreements termination that was recorded in securities gains on the Consolidated Statements of Income.