Business Segment Reporting (Detail) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2016 USD ($)		Jun. 30, 2015 USD ($)		Jun. 30, 2016 USD ($) segments		Jun. 30, 2015 USD ($)
Number of Operating Segments | segments					3
Segment Reporting Information Average Total Loans	$ 141,238		$ 132,829		$ 139,805		$ 133,082
Segment Reporting Information Average Total Deposits	154,166		142,851		151,698		141,670
Average total assets	198,305		188,310		195,660		188,785
Average total liabilities	174,287		165,071		171,753		165,579
Average total equity	24,018		23,239		23,907		23,206
Net, interest income	1,288		1,167		2,569		2,307
FTE adjustment	35		36		71		71
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	1,323	[1]	1,203	[2]	2,640	[1]	2,378	[1]
Provision for Loan, Lease, and Other Losses	146	[3]	26	[3]	246	[4]	82	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	1,177		1,177		2,394		2,296
Total noninterest income	898		874		1,680		1,692
Noninterest Expense	1,345		1,328		2,663		2,608
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	730		723		1,411		1,380
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	236	[5]	238	[5]	467	[6]	464	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	494		485		944		916
Net Income (Loss) Attributable to Noncontrolling Interest	2		2		5		4
Net Income (Loss) Attributable to Parent	492		483		939		912
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans	42,513		40,339		42,054		40,730
Segment Reporting Information Average Total Deposits	97,052		91,235		95,171		90,873
Average total assets	48,181		46,485		47,723		46,804
Average total liabilities	97,626		91,854		95,765		91,506
Average total equity	0		0		0		0
Net, interest income	705		675		1,404		1,341
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	705	[2]	675	[2]	1,404	[1]	1,341	[1]
Provision for Loan, Lease, and Other Losses	49	[3]	9	[3]	77	[4]	79	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	656		666		1,327		1,262
Total noninterest income	366		389		721		752
Noninterest Expense	758		730		1,503		1,460
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	264		325		545		554
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	98	[5]	121	[5]	202	[6]	206	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	166		204		343		348
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	166		204		343		348
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans	72,066		67,643		71,412		67,689
Segment Reporting Information Average Total Deposits	54,105		48,639		53,848		48,105
Average total assets	86,058		81,003		85,218		81,082
Average total liabilities	59,804		54,281		59,636		53,987
Average total equity	0		0		0		0
Net, interest income	448		444		902		875
FTE adjustment	34		36		69		70
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	482	[2]	480	[2]	971	[1]	945	[1]
Provision for Loan, Lease, and Other Losses	103	[3]	30	[3]	186	[4]	26	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	379		450		785		919
Total noninterest income	301		337		587		622
Noninterest Expense	414		386		822		783
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	266		401		550		758
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	81	[5]	138	[5]	170	[6]	258	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	185		263		380		500
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	185		263		380		500
Mortgage Banking
Segment Reporting Information Average Total Loans	26,590		24,793		26,268		24,617
Segment Reporting Information Average Total Deposits	2,997		2,980		2,654		2,671
Average total assets	30,117		28,555		29,660		28,247
Average total liabilities	3,387		3,505		3,037		3,062
Average total equity	0		0		0		0
Net, interest income	111		123		224		244
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	111	[2]	123	[2]	224	[1]	244	[1]
Provision for Loan, Lease, and Other Losses	(6)	[3]	(13)	[3]	(16)	[4]	(23)	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	117		136		240		267
Total noninterest income	165		105		289		236
Noninterest Expense	178		180		353		357
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	104		61		176		146
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	40	[5]	3	[5]	67	[6]	33	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	64		58		109		113
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	64		58		109		113
Corporate Other
Segment Reporting Information Average Total Loans	72		64		72		54
Segment Reporting Information Average Total Deposits	80		80		83		85
Average total assets	31,499		29,592		31,032		29,305
Average total liabilities	13,468		15,549		13,323		17,122
Average total equity	0		0		0		0
Net, interest income	27		34		57		64
FTE adjustment	1		1		1		1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	28	[2]	35	[2]	58	[1]	65	[1]
Provision for Loan, Lease, and Other Losses	0		0		0		0
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	28		35		58		65
Total noninterest income	70		47		92		89
Noninterest Expense	1		35		5		15
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	99		47		155		139
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	26	[5]	19	[5]	42	[6]	50	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	73		28		113		89
Net Income (Loss) Attributable to Noncontrolling Interest	2		2		5		5
Net Income (Loss) Attributable to Parent	71		26		108		84
Reconciling Items
Segment Reporting Information Average Total Loans	(3)		(10)		(1)		(8)
Segment Reporting Information Average Total Deposits	(68)		(83)		(58)		(64)
Average total assets	2,450		2,675		2,027		3,347
Average total liabilities	2		(118)		(8)		(98)
Average total equity	24,018		23,239		23,907		23,206
Net, interest income	(3)		(109)		(18)		(217)
FTE adjustment	0		(1)		1		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	(3)	[2]	(110)	[2]	(17)	[1]	(217)	[1]
Provision for Loan, Lease, and Other Losses	0		0		(1)		0
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(3)		(110)		(16)		(217)
Total noninterest income	(4)		(4)		(9)		(7)
Noninterest Expense	(4)		(3)		(10)		(7)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(3)		(111)		(15)		(217)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(9)	[5]	(43)	[5]	(14)	[6]	(83)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	6		(68)		(1)		(134)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		(1)
Net Income (Loss) Attributable to Parent	$ 6		$ (68)		$ (1)		$ (133)

[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/(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.

[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 income tax provision and taxable-equivalent income adjustment reversal.

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