MSR (Changes in the Servicing Assets) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Mar. 31, 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				12
Amortization				(27)
Carrying amount before valuation allowance				1,189
Valuation allowance for servicing rights:
Beginning balance				(419)
(Provision for) recovery of MSR impairment				(85)
Ending balance				(504)
Carrying amount as of the end of the period		$ 776	[1]	$ 685	$ 744
Fair value at beginning of period		744
Servicing rights originated		26
Servicing rights acquired		29
Changes in fair value due to changes in inputs or assumptions	[2]	4
Changes in fair value due to other changes in fair value	[3]	(27)
Fair value at end of period		$ 776

[1] Effective January 1, 2017, the Bancorp has elected the fair value measurement method for all existing classes of its r esidential mortgage servicing rights. The servicing rights were measured at fair value at March 31, 2017 and were measured under the amortization method at December 31, 2016. For further information refer to Note 11 .

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

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