Business Segment Reporting (Detail) $ in Millions		3 Months Ended
		Mar. 31, 2016 USD ($) segments	Mar. 31, 2015 USD ($)
Number of Operating Segments | segments		3
Segment Reporting Information Average Total Loans		$ 138,372	$ 133,338
Segment Reporting Information Average Total Deposits		149,229	140,476
Average total assets		193,014	189,265
Average total liabilities		169,217	166,093
Average total equity		23,797	23,172
Net, interest income		1,282	1,140
FTE adjustment		36	35
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	[1]	1,318	1,175
Provision for Loan, Lease, and Other Losses	[2]	101	55
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		1,217	1,120
Total noninterest income		781	817
Noninterest Expense		1,318	1,280
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		680	657
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[3]	231	226
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		449	431
Net Income (Loss) Attributable to Noncontrolling Interest		2	2
Net Income (Loss) Attributable to Parent		447	429
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans		41,597	41,127
Segment Reporting Information Average Total Deposits		93,314	90,507
Average total assets		47,268	47,129
Average total liabilities		93,933	91,158
Average total equity		0	0
Net, interest income		700	666
FTE adjustment		0	0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	[1]	700	666
Provision for Loan, Lease, and Other Losses	[2]	29	70
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		671	596
Total noninterest income		355	363
Noninterest Expense		748	730
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		278	229
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[3]	104	85
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		174	144
Net Income (Loss) Attributable to Noncontrolling Interest		0	0
Net Income (Loss) Attributable to Parent		174	144
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans		70,757	67,733
Segment Reporting Information Average Total Deposits		53,567	47,565
Average total assets		84,375	81,160
Average total liabilities		59,439	53,685
Average total equity		0	0
Net, interest income		457	430
FTE adjustment		35	34
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	[1]	492	464
Provision for Loan, Lease, and Other Losses	[2]	82	(4)
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		410	468
Total noninterest income		285	285
Noninterest Expense		407	397
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		288	356
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[3]	91	120
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		197	236
Net Income (Loss) Attributable to Noncontrolling Interest		0	0
Net Income (Loss) Attributable to Parent		197	236
Mortgage Banking
Segment Reporting Information Average Total Loans		25,946	24,439
Segment Reporting Information Average Total Deposits		2,311	2,359
Average total assets		29,203	27,936
Average total liabilities		2,686	2,615
Average total equity		0	0
Net, interest income		112	121
FTE adjustment		0	0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	[1]	112	121
Provision for Loan, Lease, and Other Losses	[2]	(10)	(10)
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		122	131
Total noninterest income		124	132
Noninterest Expense		175	178
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		71	85
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[3]	26	30
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		45	55
Net Income (Loss) Attributable to Noncontrolling Interest		0	0
Net Income (Loss) Attributable to Parent		45	55
Corporate Other
Segment Reporting Information Average Total Loans		72	43
Segment Reporting Information Average Total Deposits		85	90
Average total assets		30,564	29,013
Average total liabilities		13,178	18,713
Average total equity		0	0
Net, interest income		30	29
FTE adjustment		1	1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	[1]	31	30
Provision for Loan, Lease, and Other Losses		0	0	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		31	30
Total noninterest income		22	42
Noninterest Expense		(6)	(19)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		59	91
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[3]	18	31
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		41	60
Net Income (Loss) Attributable to Noncontrolling Interest		2	2
Net Income (Loss) Attributable to Parent		39	58
Reconciling Items
Segment Reporting Information Average Total Loans		0	(4)
Segment Reporting Information Average Total Deposits		(48)	(45)
Average total assets		1,604	4,027
Average total liabilities		(19)	(78)
Average total equity		23,797	23,172
Net, interest income		(17)	(106)
FTE adjustment		0	0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	[1]	(17)	(106)
Provision for Loan, Lease, and Other Losses		0	(1)	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		(17)	(105)
Total noninterest income		(5)	(5)
Noninterest Expense		(6)	(6)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		(16)	(104)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[3]	(8)	(40)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(8)	(64)
Net Income (Loss) Attributable to Noncontrolling Interest		0	0
Net Income (Loss) Attributable to Parent		$ (8)	$ (64)

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

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

[3] Includes regular income tax provision and taxable-equivalent income adjustment reversal.