Asset Transfers in Which the Company has Continuing Economic Involvement (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows on interests held		$ (19)	$ (21)	$ (36)
Other Noninterest Expense	[1]	$ 441	$ 498	$ 549

[1] Amortization expense related to qualified affordable housing investment costs is recognized in provision for income taxes for each of the periods presented as allowed by an accounting standard adopted in 2014. Accordingly, $49 million of related amortization expense for the year ended December 31, 2013 was reclassified from other noninterest expense to provision for income taxes.