Components of Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Change in net unrealized gain on Securities available for sale:
Net unrealized (loss) gain	$ (3)	$ 89
Reclassification of impairment charges included in net impairment losses on securities	4	18
Change in net unrealized gain on securities available for sale	1	107
Other	1
Other comprehensive income, before tax	2	107
Change in net unrealized gain on Securities available for sale:
Net unrealized (loss) gain	(2)	32
Reclassification of impairment charges included in net impairment losses on securities	2	7
Change in net unrealized gain on securities available for sale		39
Other
Other comprehensive income, tax effect		39
Change in net unrealized gain on securities available for sale:
Net unrealized (loss) gain	(1)	57
Reclassification of impairment charges included in net impairment losses on securities	2	11
Change in net unrealized gain on securities available for sale	1	68
Other	1
Other comprehensive income, net of tax	$ 2	$ 68

Before tax change in net unrealized gain (loss) on securities available for sale.

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