Credit Quality (Summary of Transactions in the ALLL by Portfolio segment) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses
Beginning Balance	$ 1,295		$ 1,300	$ 1,272	[1],[2]	$ 1,322
Losses charged-off	(105)		(112)	(222)		(227)
Recoveries of losses previously charged- off	18		26	39		50
Provision for loan and lease losses	91		79	210		148
Ending Balance	1,299	[1],[3]	1,293	1,299	[1],[3]	1,293
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Beginning Balance	867	[3]	852	840	[2]	875
Losses charged-off	(51)		(54)	(112)		(102)
Recoveries of losses previously charged- off	5		9	11		18
Provision for loan and lease losses	52		48	134		64
Ending Balance	873	[3]	855	873	[3]	855
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Beginning Balance	98	[3]	103	100	[2]	104
Losses charged-off	(5)		(8)	(10)		(17)
Recoveries of losses previously charged- off	3		3	5		6
Provision for loan and lease losses	2		6	3		11
Ending Balance	98	[3]	104	98	[3]	104
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Beginning Balance	214	[3]	241	217	[2]	237
Losses charged-off	(49)		(50)	(100)		(108)
Recoveries of losses previously charged- off	10		14	23		26
Provision for loan and lease losses	36		26	71		76
Ending Balance	211	[3]	231	211	[3]	231
Unallocated
Financing Receivable, Allowance for Credit Losses
Beginning Balance	116	[3]	104	115	[2]	106
Provision for loan and lease losses	1		(1)	2		(3)
Ending Balance	$ 117	[3]	$ 103	$ 117	[3]	$ 103

[1] Includes $ 128 and $ 152 of cash and due from banks, $ 1,853 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 $ 1,744 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2016 and December 31, 2015 , respectively. For further information refer to Note 9 .

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

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