MSR (Activity Related to Mortgage Banking Net Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale
Residential mortgage loan sales	[1]	$ 1,631	$ 1,377	$ 2,745	$ 2,378	[2]
Origination fees and gains on loan sales		54	43	95	87
Gross Mortgage Servicing Fees		$ 50	$ 56	$ 102	$ 115

[1] Represents the unpaid principal balance at the time of the sale.

[2] Excludes $ 568 of HFS residential mortgage loans previously modified in a TDR that were sold during the first quarter of 2015 .