MSR (Changes in the Servicing Assets) (Detail) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016	[1]
Servicing Assets at Fair Value
Carrying amount before valuation allowance as of the beginning of the period					$ 1,204
Servicing rights that result from the transfer of residential mortgage loans					55
Amortization		$ (35)			(96)
Carrying amount before valuation allowance		1,163			1,163
Valuation allowance for servicing rights:
Beginning balance					(419)
(Provision for) recovery of MSR impairment					(125)
Ending balance		(544)			(544)
Carrying amount as of the end of the period		$ 619	$ 848	[1]	$ 619	$ 744
Fair value at beginning of period			744
Servicing rights originated			99
Servicing rights acquired			109
Changes in fair value due to changes in inputs or assumptions	[2]		(15)
Changes in fair value due to other changes in fair value	[3]		(89)
Fair value at end of period			$ 848

[1] Effective January 1, 2017, the Bancorp has elected the fair value measurement method for all existing classes of its residential mortgage servicing rights. Th e servicing rights were measured at fair value at September 30, 2017 and were measured under the amortization method at December 31, 2016. For further information refer to Note 12 .

[2] Primarily reflects changes in prepayment speed and OAS spread assumptions which are updated based on market interest rates

[3] Pr imarily reflects changes due to collection of contractual cash flows and the passage of time