Business Segment Reporting (Detail) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)		Jun. 30, 2015 USD ($) segments		Jun. 30, 2014 USD ($)
Number of Operating Segments | segments					3
Segment Reporting Information Average Total Loans	$ 132,829		$ 130,734		$ 133,082		$ 129,635
Segment Reporting Information Average Total Deposits	142,851		130,472		141,670		129,440
Average total assets	188,310		179,820		188,785		178,404
Average total liabilities	165,071		157,826		165,579		156,543
Average total equity	23,239		21,994		23,206		21,861
Net, interest income	1,167		1,209		2,307		2,414
FTE adjustment	36		35		71		69
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	1,203	[1]	1,244	[1]	2,378	[2]	2,483	[2]
Provision for Loan, Lease, and Other Losses	26	[3]	73	[3]	82	[4]	175	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	1,177		1,171		2,296		2,308
Total noninterest income	874		957		1,692		1,748
Noninterest Expense	1,328		1,517		2,608		2,874
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	723		611		1,380		1,182
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	238	[5]	208	[5]	464	[6]	367	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	485		403		916		815
Net Income (Loss) Attributable to Noncontrolling Interest	2		4		4		11
Net Income (Loss) Attributable to Parent	483		399		912		804
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans	40,337		41,517		40,727		41,387
Segment Reporting Information Average Total Deposits	91,287		85,154		90,927		84,681
Average total assets	46,486		47,196		46,805		47,066
Average total liabilities	91,912		85,867		91,566		85,448
Average total equity	0		0		0		0
Net, interest income	676		649		1,342		1,291
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	676	[1]	649	[1]	1,342	[2]	1,291	[2]
Provision for Loan, Lease, and Other Losses	9	[3]	42	[3]	79	[4]	95	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	667		607		1,263		1,196
Total noninterest income	390		381		752		743
Noninterest Expense	725		727		1,446		1,432
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	332		261		569		507
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	124	[5]	96	[5]	212	[6]	186	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	208		165		357		321
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	208		165		357		321
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans	67,645		61,366		67,691		60,159
Segment Reporting Information Average Total Deposits	48,587		43,063		48,051		42,683
Average total assets	81,026		72,691		81,129		71,375
Average total liabilities	54,175		49,815		53,885		49,407
Average total equity	0		0		0		0
Net, interest income	444		410		874		801
FTE adjustment	35		34		69		68
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	479	[1]	444	[1]	943	[2]	869	[2]
Provision for Loan, Lease, and Other Losses	30	[3]	8	[3]	26	[4]	30	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	449		436		917		839
Total noninterest income	344		312		656		587
Noninterest Expense	395		390		802		813
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	398		358		771		613
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	136	[5]	120	[5]	262	[6]	202	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	262		238		509		411
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	262		238		509		411
Mortgage Banking
Segment Reporting Information Average Total Loans	24,793		27,803		24,617		28,043
Segment Reporting Information Average Total Deposits	2,980		2,220		2,671		2,054
Average total assets	28,555		31,251		28,247		31,400
Average total liabilities	3,505		2,762		3,062		2,600
Average total equity	0		0		0		0
Net, interest income	123		140		244		274
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	123	[1]	140	[1]	244	[2]	274	[2]
Provision for Loan, Lease, and Other Losses	(13)	[3]	24	[3]	(23)	[4]	50	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	136		116		267		224
Total noninterest income	105		119		236		219
Noninterest Expense	180		364		357		550
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	61		(129)		146		(107)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	4	[5]	(47)	[5]	34	[6]	(41)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	57		(82)		112		(66)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	57		(82)		112		(66)
Corporate Other
Segment Reporting Information Average Total Loans	64		52		54		52
Segment Reporting Information Average Total Deposits	80		90		85		85
Average total assets	29,568		25,971		29,257		25,798
Average total liabilities	15,597		19,378		17,164		19,113
Average total equity	0		0		0		0
Net, interest income	34		73		63		149
FTE adjustment	1		1		1		2
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	35	[1]	74	[1]	64	[2]	151	[2]
Provision for Loan, Lease, and Other Losses	0	[3]	0	[3]	0	[4]	0	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	35		74		64		151
Total noninterest income	39		150		55		209
Noninterest Expense	32		38		12		87
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	42		186		107		273
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	18	[5]	64	[5]	39	[6]	66	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	24		122		68		207
Net Income (Loss) Attributable to Noncontrolling Interest	2		5		5		11
Net Income (Loss) Attributable to Parent	22		117		63		196
Reconciling Items
Segment Reporting Information Average Total Loans	(10)		(4)		(7)		(6)
Segment Reporting Information Average Total Deposits	(83)		(55)		(64)		(63)
Average total assets	2,675		2,711		3,347		2,765
Average total liabilities	(118)		4		(98)		(25)
Average total equity	23,239		21,994		23,206		21,861
Net, interest income	(110)		(63)		(216)		(101)
FTE adjustment	0		0		1		(1)
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	(110)	[1]	(63)	[1]	(215)	[2]	(102)	[2]
Provision for Loan, Lease, and Other Losses	0	[3]	(1)	[3]	0	[4]	0	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(110)		(62)		(215)		(102)
Total noninterest income	(4)		(5)		(7)		(10)
Noninterest Expense	(4)		(2)		(9)		(8)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(110)		(65)		(213)		(104)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(44)	[5]	(25)	[5]	(83)	[6]	(46)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(66)		(40)		(130)		(58)
Net Income (Loss) Attributable to Noncontrolling Interest	0		(1)		(1)		0
Net Income (Loss) Attributable to Parent	$ (66)		$ (39)		$ (129)		$ (58)

[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 of 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 of the provision/(benefit) attributable to quarterly changes in the ALLL and unfunded commitment reserve balances.

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

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