Business Segment Reporting (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($) segments		Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Number of Operating Segments | segments		3
Segment Reporting Information Average Total Loans		$ 133,558		$ 130,874	$ 122,657
Segment Reporting Information Average Total Deposits		144,202		132,012	127,076
Average total assets		188,892		182,176	172,497
Average total liabilities		165,546		160,006	151,330
Average total equity		23,346		22,170	21,167
Net, interest income		4,764		4,840	4,853
FTE adjustment		142		142	127
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment		4,906		4,982	4,980
Provision for Loan, Lease, and Other Losses		165		342	553
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		4,741		4,640	4,427
Total noninterest income		3,268		3,323	3,214
Noninterest Expense		5,160		5,543	5,831
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		2,849		2,420	1,810
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal		906		635	449
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		1,943		1,785	1,361
Net Income (Loss) Attributable to Noncontrolling Interest		10		11	17
Net Income (Loss) Attributable to Parent		1,933		1,774	1,344
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans		40,632		41,700	40,510
Segment Reporting Information Average Total Deposits		91,127		86,070	84,289
Average total assets		46,498		47,380	45,538
Average total liabilities		91,776		86,798	85,167
Average total equity		0		0	0
Net, interest income		2,729		2,629	2,595
FTE adjustment		1		1	1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment		2,730		2,630	2,596
Provision for Loan, Lease, and Other Losses		137		191	261
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		2,593		2,439	2,335
Total noninterest income		1,508		1,527	1,482
Noninterest Expense		2,902		2,866	2,783
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		1,199		1,100	1,034
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal		445		405	381
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		754		695	653
Net Income (Loss) Attributable to Noncontrolling Interest		0		0	0
Net Income (Loss) Attributable to Parent		754		695	653
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans		67,853		62,638	54,142
Segment Reporting Information Average Total Deposits		50,376		43,566	39,572
Average total assets		80,951		74,302	66,095
Average total liabilities		55,995		50,310	46,693
Average total equity		0		0	0
Net, interest income		1,771		1,659	1,547
FTE adjustment		138		139	124
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment		1,909		1,798	1,671
Provision for Loan, Lease, and Other Losses		137		71	124
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		1,772		1,727	1,547
Total noninterest income		1,215		1,104	1,103
Noninterest Expense		1,575		1,552	1,455
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		1,412		1,279	1,195
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal		458		404	388
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		954		875	807
Net Income (Loss) Attributable to Noncontrolling Interest		0		0	0
Net Income (Loss) Attributable to Parent		954		875	807
Mortgage Banking
Segment Reporting Information Average Total Loans		25,024		26,494	27,974
Segment Reporting Information Average Total Deposits		2,679		2,333	3,206
Average total assets		28,692		30,386	32,708
Average total liabilities		3,048		2,665	3,845
Average total equity		0		0	0
Net, interest income		483		552	539
FTE adjustment		0		0	0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment		483		552	539
Provision for Loan, Lease, and Other Losses		(110)		81	170
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		593		471	369
Total noninterest income		460		473	402
Noninterest Expense		682		1,049	1,503
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		371		(105)	(732)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal		84		(52)	(205)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		287		(53)	(527)
Net Income (Loss) Attributable to Noncontrolling Interest		0		0	0
Net Income (Loss) Attributable to Parent		287		(53)	(527)
Corporate Other
Segment Reporting Information Average Total Loans		61		48	50
Segment Reporting Information Average Total Deposits		80		91	98
Average total assets		29,634		26,966	26,505
Average total liabilities		14,797		20,243	15,720
Average total equity		0		0	0
Net, interest income		147		276	316
FTE adjustment		3		3	3
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment		150		279	319
Provision for Loan, Lease, and Other Losses		0		0	(1)
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		150		279	320
Total noninterest income		99		238	237
Noninterest Expense		15		92	100
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		234		425	457
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[1]	66		(20)	(68)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		168		445	525
Net Income (Loss) Attributable to Noncontrolling Interest		9		11	17
Net Income (Loss) Attributable to Parent		159		434	508
Reconciling Items
Segment Reporting Information Average Total Loans		(12)		(6)	(19)
Segment Reporting Information Average Total Deposits		(60)		(48)	(89)
Average total assets		3,117		3,142	1,651
Average total liabilities		(70)		(10)	(95)
Average total equity		23,346		22,170	21,167
Net, interest income		(366)		(276)	(144)
FTE adjustment		0		(1)	(1)
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment		(366)		(277)	(145)
Provision for Loan, Lease, and Other Losses		1	[2]	(1)	(1)	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment		(367)		(276)	(144)
Total noninterest income		(14)		(19)	(10)
Noninterest Expense		(14)		(16)	(10)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest		(367)		(279)	(144)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	[1]	(147)		(102)	(47)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(220)		(177)	(97)
Net Income (Loss) Attributable to Noncontrolling Interest		1		0	0
Net Income (Loss) Attributable to Parent		$ (221)		$ (177)	$ (97)

[1] Includes regular income tax provision/(benefit) and taxable-equivalent income adjustment reversal.

[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.