Business Segment Reporting (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segments		Mar. 31, 2014
Number of Operating Segments	3
Segment Reporting Information Average Total Loans	$ 133,338		$ 128,525
Segment Reporting Information Average Total Deposits	140,476		128,396
Average total assets	189,265		176,971
Average total liabilities	166,093		155,244
Average total equity	23,172		21,727
Net, interest income	1,140		1,204
FTE adjustment	35		35
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	1,175	[1]	1,239	[1]
Provision for Loan, Lease, and Other Losses	55		102
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	1,120		1,137
Total noninterest income	817		791
Noninterest Expense	1,280		1,357
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	657		571
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	226	[2]	160	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	431		411
Net Income (Loss) Attributable to Noncontrolling Interest	2		6
Net Income (Loss) Attributable to Parent	429		405
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans	41,128		41,259
Segment Reporting Information Average Total Deposits	90,681		84,358
Average total assets	47,133		46,938
Average total liabilities	91,336		85,179
Average total equity	0		0
Net, interest income	667		644
FTE adjustment	0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	667	[1]	644	[1]
Provision for Loan, Lease, and Other Losses	70	[3]	53	[3]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	597		591
Total noninterest income	363		361
Noninterest Expense	720		707
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	240		245
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	89	[2]	90	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	151		155
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	151		155
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans	67,732		58,936
Segment Reporting Information Average Total Deposits	47,478		42,287
Average total assets	81,227		70,041
Average total liabilities	53,559		48,984
Average total equity	0		0
Net, interest income	428		391
FTE adjustment	34		34
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	462	[1]	425	[1]
Provision for Loan, Lease, and Other Losses	(4)	[3]	23	[3]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	466		402
Total noninterest income	311		275
Noninterest Expense	407		418
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	370		259
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	125	[2]	83	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	245		176
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	245		176
Mortgage Banking
Segment Reporting Information Average Total Loans	24,439		28,286
Segment Reporting Information Average Total Deposits	2,359		1,887
Average total assets	27,936		31,550
Average total liabilities	2,615		2,435
Average total equity	0		0
Net, interest income	121		134
FTE adjustment	0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	121	[1]	134	[1]
Provision for Loan, Lease, and Other Losses	(10)	[3]	26	[3]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	131		108
Total noninterest income	132		100
Noninterest Expense	177		186
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	86		22
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	28	[2]	6	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	58		16
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	58		16
Corporate Other
Segment Reporting Information Average Total Loans	43		51
Segment Reporting Information Average Total Deposits	3		(64)
Average total assets	28,943		25,622
Average total liabilities	18,661		18,702
Average total equity	0		0
Net, interest income	27		75
FTE adjustment	1		1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	28	[1]	76	[1]
Provision for Loan, Lease, and Other Losses	0	[3]	0	[3]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	28		76
Total noninterest income	16		59
Noninterest Expense	(20)		50
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	64		85
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	22	[2]	1	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	42		84
Net Income (Loss) Attributable to Noncontrolling Interest	2		6
Net Income (Loss) Attributable to Parent	40		78
Reconciling Items
Segment Reporting Information Average Total Loans	(4)		(7)
Segment Reporting Information Average Total Deposits	(45)		(72)
Average total assets	4,026		2,820
Average total liabilities	(78)		(56)
Average total equity	23,172		21,727
Net, interest income	(103)		(40)
FTE adjustment	0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	(103)	[1]	(40)	[1]
Provision for Loan, Lease, and Other Losses	(1)	[3]	0	[3]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(102)		(40)
Total noninterest income	(5)		(4)
Noninterest Expense	(4)		(4)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(103)		(40)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(38)	[2]	(20)	[2]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(65)		(20)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss) Attributable to Parent	$ (65)		$ (20)

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

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

[3] 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.