Credit Quality (Summary of Transactions in the ALLL by Portfolio segment) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
FinancingReceivableAllowanceForCreditLossesLineItems
Balance, beginning of period	$ 1,138	[1],[2]	$ 1,238	$ 1,196	[2],[3]	$ 1,253	[2],[3]
Losses charged-off	(118)	[4]	(95)	(222)	[5]	(202)
Recoveries of losses previously charged- off	24	[4]	31	47	[5]	49
Provision for (benefit from) loan and lease losses	33		52	56		126
Balance, end of period	1,077	[1],[2]	1,226	1,077	[1],[2]	1,226
Commercial Portfolio Segment
FinancingReceivableAllowanceForCreditLossesLineItems
Balance, beginning of period	713	[1]	826	753	[3]	831	[3]
Losses charged-off	(54)		(41)	(87)		(86)
Recoveries of losses previously charged- off	5		17	11		21
Provision for (benefit from) loan and lease losses	(10)		15	(23)		51
Balance, end of period	654	[1]	817	654	[1]	817
Residential Mortgage Loans
FinancingReceivableAllowanceForCreditLossesLineItems
Balance, beginning of period	89	[1]	96	89	[3]	96	[3]
Losses charged-off	(4)		(4)	(7)		(10)
Recoveries of losses previously charged- off	2		2	3		3
Provision for (benefit from) loan and lease losses	(1)		(1)	1		4
Balance, end of period	86	[1]	93	86	[1]	93
Consumer Portfolio Segment
FinancingReceivableAllowanceForCreditLossesLineItems
Balance, beginning of period	222	[1]	204	234	[3]	214	[3]
Losses charged-off	(60)	[4]	(50)	(128)	[5]	(106)
Recoveries of losses previously charged- off	17	[4]	12	33	[5]	25
Provision for (benefit from) loan and lease losses	50		40	90		73
Balance, end of period	229	[1]	206	229	[1]	206
Unallocated
FinancingReceivableAllowanceForCreditLossesLineItems
Balance, beginning of period	114	[1]	112	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	(6)		(2)	(12)		(2)
Balance, end of period	$ 108	[1]	$ 110	$ 108	[1]	$ 110

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

[2] Includes $ 47 and $ 62 of other short-term investments , $ 908 and $ 1,297 of portfolio loans and leases, $ (5) and $ (6) of ALLL, $ 5 and $ 7 of other assets, $ 2 and $ 2 of other liabilities, and $ 830 and $ 1,190 of long-term debt from consolidated VIEs that are included in their respe ctive captions above at June 30, 2018 and December 31, 2017 , respectively. For further information refer to Note 9 .

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

[4] (a) For the three months ended June 30, 2018, the Bancorp recorded $6 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 six months ended June 30, 2018, the Bancorp recorded $10 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.