Business Segment Reporting (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) segments		Mar. 31, 2016 USD ($)
Number of Operating Segments | segments	3
Segment Reporting Information Average Total Loans	$ 143,670		$ 138,372
Segment Reporting Information Average Total Deposits	158,874		149,229
Average total assets	204,252		193,014
Average total liabilities	180,581		169,217
Average total equity	23,671		23,797
Net, interest income	1,366		1,282
FTE adjustment	34		36
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	1,400	[1]	1,318	[2]
Provision for Loan, Lease, and Other Losses	119	[3]	101	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	1,281		1,217
Total noninterest income	847		781
Noninterest Expense	1,465		1,318
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	663		680
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	193	[5]	231	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	470		449
Net Income (Loss) Attributable to Noncontrolling Interest	2		2
Net Income (Loss) Attributable to Parent	468		447
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans	44,074		41,589
Segment Reporting Information Average Total Deposits	98,871		93,238
Average total assets	49,794		47,285
Average total liabilities	99,478		93,853
Average total equity	0		0
Net, interest income	766		719
FTE adjustment	0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	766	[1]	719	[2]
Provision for Loan, Lease, and Other Losses	88	[3]	29	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	678		690
Total noninterest income	350		356
Noninterest Expense	797		741
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	231		305
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	85	[5]	113	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	146		192
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	146		192
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans	72,451		70,773
Segment Reporting Information Average Total Deposits	57,393		53,620
Average total assets	85,864		84,363
Average total liabilities	63,108		59,496
Average total equity	0		0
Net, interest income	543		495
FTE adjustment	34		35
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	577	[1]	530	[2]
Provision for Loan, Lease, and Other Losses	31	[3]	82	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	546		448
Total noninterest income	403		313
Noninterest Expense	482		411
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	467		350
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	174	[5]	131	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	293		219
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	293		219
Mortgage Banking
Segment Reporting Information Average Total Loans	27,078		25,946
Segment Reporting Information Average Total Deposits	2,543		2,311
Average total assets	31,475		29,203
Average total liabilities	2,861		2,686
Average total equity	0		0
Net, interest income	113		120
FTE adjustment	0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	113	[1]	120	[2]
Provision for Loan, Lease, and Other Losses	0	[3]	(10)	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	113		130
Total noninterest income	115		126
Noninterest Expense	184		174
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	44		82
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	15	[5]	32	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	29		50
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	29		50
Corporate Other [Member]
Segment Reporting Information Average Total Loans	67		64
Segment Reporting Information Average Total Deposits	117		107
Average total assets	34,005		30,560
Average total liabilities	15,158		13,201
Average total equity	0		0
Net, interest income	11		31
FTE adjustment	1		1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	12	[1]	32	[2]
Provision for Loan, Lease, and Other Losses	0	[3]	0	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	12		32
Total noninterest income	23		20
Noninterest Expense	6		(4)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	29		56
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(16)	[5]	16	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	45		40
Net Income (Loss) Attributable to Noncontrolling Interest	2		2
Net Income (Loss) Attributable to Parent	43		38
Reconciling Items
Segment Reporting Information Average Total Loans	0		0
Segment Reporting Information Average Total Deposits	(50)		(47)
Average total assets	3,114		1,603
Average total liabilities	(24)		(19)
Average total equity	23,671		23,797
Net, interest income	(67)		(83)
FTE adjustment	(1)		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	(68)	[1]	(83)	[2]
Provision for Loan, Lease, and Other Losses	0	[3]	0	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(68)		(83)
Total noninterest income	(44)		(34)
Noninterest Expense	(4)		(4)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(108)		(113)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(65)	[5]	(61)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(43)		(52)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	$ (43)		$ (52)

[1] Presented on a matched maturity funds transfer price basis for the segments.

[2] Presented on a matched maturity funds transfer price basis for the segments.

[3] Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision attributable to quarterly changes in the ALLL and unfunded commitment reserve balances.

[4] Provision/(benefit) for credit losses represents net charge-offs by segment combined with an allocation to the segments for the provision/(benefit) attributable to quarterly changes in the ALLL and unfunded commitment reserve balances.

[5] Includes regular provision for income taxes as well as FTE income and tax credit adjustment reversals.

[6] Includes regular provision for income taxes as well as FTE income and tax credit adjustment reversals.