Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Executed Equity Forward Agreements, Losses Recognized In Securities Gains	$ 305
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
AOCI, beginning balance	2,744		2,531	1,661
Unrealized net gain on securities	198		653	770
Unrealized net gain on derivatives	141		684	802
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(95)		(382)	106
Reclassification adjustment for realized gains and losses on securities	(2,279)	[1]	(117)	(191)
Reclassification adjustment for realized gains and losses on derivatives	(203)		(625)	(617)
AOCI, ending balance	506		2,744	2,531
Accumulated Other Comprehensive Income Loss Tax [Abstract]
AOCI, beginning balance	(995)		(915)	(591)
Unrealized net gain on securities	(269)		(242)	(283)
Unrealized net gain on derivatives	143		(253)	(293)
Change related to employee benefit plans	35		141	46
Reclassification adjustment for realized gains and losses on securities	1,007	[1]	43	70
Reclassification adjustment for realized gains and losses on derivatives	(118)		231	228
AOCI, ending balance	(197)		(995)	(915)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
AOCI, beginning balance	1,749		1,616	1,070
Unrealized net gain on securities	(71)		411	487
Unrealized net gain on derivatives	284		431	509
Change related to employee benefit plans	(60)		(241)	60
Reclassification adjustment for realized gains and losses on securities	(1,272)	[1]	(74)	(121)
Reclassification adjustment for realized gains and losses on derivatives	(321)		(394)	(389)
AOCI, ending balance	$ 309		$ 1,749	$ 1,616

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