Credit Quality (Summary of Transactions in the ALLL by Portfolio segment) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	$ 1,299		$ 1,293	$ 1,272	[1],[2]	$ 1,322
Losses charged-off	(137)		(209)	(359)		(437)
Recoveries of losses previously charged- off	30		21	70		71
Provision for (benefit from) loan and lease losses	80		156	289		305
Balance, end of period	1,272	[1],[3]	1,261	1,272	[1],[3]	1,261
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	873		855	840	[2]	875
Losses charged-off	(81)		(149)	(192)		(251)
Recoveries of losses previously charged- off	18		7	29		24
Provision for (benefit from) loan and lease losses	44		115	177		180
Balance, end of period	854	[3]	828	854	[3]	828
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	98		104	100	[2]	104
Losses charged-off	(4)		(6)	(14)		(23)
Recoveries of losses previously charged- off	2		3	7		9
Provision for (benefit from) loan and lease losses	0		(3)	3		8
Balance, end of period	96	[3]	98	96	[3]	98
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	211		231	217	[2]	237
Losses charged-off	(52)		(54)	(153)		(163)
Recoveries of losses previously charged- off	10		11	34		38
Provision for (benefit from) loan and lease losses	38		33	109		109
Balance, end of period	207	[3]	221	207	[3]	221
Unallocated
Financing Receivable, Allowance for Credit Losses
Balance, beginning of period	117		103	115	[2]	106
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)		11	0		8
Balance, end of period	$ 115	[3]	$ 114	$ 115	[3]	$ 114

[1] Includes $ 112 and $ 152 of cash and due from banks, $ 1,560 and $ 2,537 of portfolio loans and leases , $ (28) and $ (28) of ALLL, $ 11 and $ 14 of other assets, $ 3 and $ 3 of other liabilities , and $ 1,422 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2016 and December 31, 2015 , respectively. For further information refer to Note 10 .

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

[3] Includes $ 2 related to leveraged leases at September 30, 2016 .