Credit Quality (Summary of Transactions in the ALLL by Portfolio segment) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	$ 1,238		$ 1,295	$ 1,253	[1],[2]	$ 1,272
Losses charged-off	(95)		(105)	(202)		(222)
Recoveries of losses previously charged- off	31		18	49		39
Provision for (benefit from) loan and lease losses	52		91	126		210
Balance, end of period	1,226	[2],[3]	1,299	1,226	[2],[3]	1,299
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	826		867	831	[1]	840
Losses charged-off	(41)		(51)	(86)		(112)
Recoveries of losses previously charged- off	17		5	21		11
Provision for (benefit from) loan and lease losses	15		52	51		134
Balance, end of period	817	[3]	873	817	[3]	873
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	96		98	96	[1]	100
Losses charged-off	(4)		(5)	(10)		(10)
Recoveries of losses previously charged- off	2		3	3		5
Provision for (benefit from) loan and lease losses	(1)		2	4		3
Balance, end of period	93	[3]	98	93	[3]	98
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	204		214	214	[1]	217
Losses charged-off	(50)		(49)	(106)		(100)
Recoveries of losses previously charged- off	12		10	25		23
Provision for (benefit from) loan and lease losses	40		36	73		71
Balance, end of period	206	[3]	211	206	[3]	211
Unallocated
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	112		116	112	[1]	115
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	(2)		1	(2)		2
Balance, end of period	$ 110	[3]	$ 117	$ 110	[3]	$ 117

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

[2] Includes $ 57 and $ 85 of cash and due from banks, $ 737 and $ 1,216 of portfolio loans and leases , $ (24) and $ (26) of ALLL, $ 7 and $ 9 of other assets, $ 1 and $ 3 of other liabilities , and $ 618 and $ 1,094 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2017 and December 31, 2016 , respectively. For further information refer to Note 10 .

[3] Includes $ 2 related to leveraged leases at June 30, 2017 .