Credit Quality (Summary of Transactions in the ALLL by Portfolio Segment) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses
Balance, Beginning of period	$ 1,272	[1]	$ 1,322		$ 1,582
Losses charged-off	(456)		(542)		(679)
Recoveries of losses previously charged-off	94		96		104
Provision for (benefit from) loan and lease losses	343		396		315
Balance, end of period	1,253	[1]	1,272	[1]	1,322
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, Beginning of period	840	[2]	875		1,058
Losses charged-off	(232)		(298)		(299)
Recoveries of losses previously charged-off	42		37		38
Provision for (benefit from) loan and lease losses	181		226		78
Balance, end of period	831	[3]	840	[2]	875
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, Beginning of period	100	[2]	104		189
Losses charged-off	(19)		(28)		(139)
Recoveries of losses previously charged-off	9		11		13
Provision for (benefit from) loan and lease losses	6		13		41
Balance, end of period	96	[3]	100	[2]	104
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, Beginning of period	217	[2]	237		225
Losses charged-off	(205)		(216)		(241)
Recoveries of losses previously charged-off	43		48		53
Provision for (benefit from) loan and lease losses	159		148		200
Balance, end of period	214	[3]	217	[2]	237
Unallocated
Financing Receivable, Allowance for Credit Losses
Balance, Beginning of period	115	[2]	106		110
Losses charged-off	0		0		0
Recoveries of losses previously charged-off	0		0		0
Provision for (benefit from) loan and lease losses	(3)		9		(4)
Balance, end of period	$ 112	[3]	$ 115	[2]	$ 106

[1] Includes $ 85 and $ 152 of cash and due from banks, $ 1,216 and $ 2,537 of portfolio loans and leases, $ (26) and $ (28) of ALLL, $ 9 and $ 14 of other assets, $ 3 and $ 3 of other liabilities and $ 1,094 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2016 and 2015 , respectively. For further information, refer to Note 11.

[2] Includes $ 5 related to leveraged leases at December 31, 2015 .

[3] Includes $ 2 related to leveraged leases at December 31, 2016 .