Credit Quality (Summary of Transactions in the ALLL by Portfolio segment) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	$ 1,077		$ 1,226	$ 1,196	[1]	$ 1,253
Losses charged-off	(112)		(85)	(334)		(287)
Recoveries of losses previously charged- off	40		17	87		66
Provision for (benefit from) loan and lease losses	86		67	142		193
Deconsolidation of a VIE			(20)			(20)
Balance, end of period	1,091	[1]	1,205	1,091	[1]	1,205
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	654	[2]	817	753	[3]	831	[3]
Losses charged-off	(36)		(33)	(124)		(119)
Recoveries of losses previously charged- off	9		3	19		25
Provision for (benefit from) loan and lease losses	29		9	8		59
Deconsolidation of a VIE			(19)			(19)
Balance, end of period	656	[2]	777	656	[2]	777
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	86	[2]	93	89	[3]	96	[3]
Losses charged-off	(3)		(2)	(10)		(12)
Recoveries of losses previously charged- off	1		3	4		7
Provision for (benefit from) loan and lease losses	(1)		(4)	0		(1)
Deconsolidation of a VIE			0			0
Balance, end of period	83	[2]	90	83	[2]	90
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	229	[2]	206	234	[3]	214	[3]
Losses charged-off	(73)	[4]	(50)	(200)	[5]	(156)
Recoveries of losses previously charged- off	30	[4]	11	64	[5]	34
Provision for (benefit from) loan and lease losses	57		51	145		126
Deconsolidation of a VIE			0			0
Balance, end of period	243	[2]	218	243	[2]	218
Unallocated
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	108	[2]	110	120	[3]	112	[3]
Losses charged-off	0		0	0		0
Recoveries of losses previously charged- off	0		0	0		0
Provision for (benefit from) loan and lease losses	1		11	(11)		9
Deconsolidation of a VIE			(1)			(1)
Balance, end of period	$ 109	[2]	$ 120	$ 109	[2]	$ 120

[1] Includes $ 41 and $ 62 of other short-term investments , $ 793 and $ 1,297 of portfolio loans and leases, $ (4) and $ (6) of ALLL, $ 5 and $ 7 of other assets, $ 1 and $ 2 of other liabilities, and $ 710 and $ 1,190 of long-term debt from consolidated VIEs that are included in their respe ctive captions above at September 30, 2018 and December 31, 2017 , respectively. For further information refer to Note 10 .

[2] Includes $ 1 related to leveraged leases at September 30, 2018 .

[3] Includes $ 1 related to leveraged leases at December 31, 2017 .

[4] (a) For the three months ended September 30, 2018, the Bancorp recorded $8 in both losses charged-off and recoveries of losses charged-off related to customer defaults on point-of-sale consumer loans for which the Bancorp obtained recoveries under third-party credit enhancements.

[5] (a) For the nine months ended September 30, 2018, the Bancorp recorded $18 in both losses charged-off and recoveries of losses charged-off related to customer defaults on point-of-sale consumer loans for which the Bancorp obtained recoveries under third-party credit enhancements.