Business Segment Reporting (Detail) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015 USD ($)		Sep. 30, 2014 USD ($)		Sep. 30, 2015 USD ($) segments		Sep. 30, 2014 USD ($)
Number of Operating Segments | segments					3
Segment Reporting Information Average Total Loans	$ 132,837		$ 130,747		$ 133,000		$ 130,010
Segment Reporting Information Average Total Deposits	145,226		132,195		142,869		130,369
Average total assets	188,341		183,433		188,635		180,098
Average total liabilities	164,957		161,242		165,369		158,126
Average total equity	23,384		22,191		23,266		21,972
Net, interest income	1,211		1,215		3,518		3,629
FTE adjustment	36		36		107		105
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	1,247	[1]	1,251	[1]	3,625	[2]	3,734	[2]
Provision for Loan, Lease, and Other Losses	32	[3]	93	[3]	114	[4]	268	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	1,215		1,158		3,511		3,466
Total noninterest income	811		780		2,503		2,528
Noninterest Expense	1,264		1,259		3,872		4,134
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	762		679		2,142		1,860
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	223	[5]	103	[5]	686	[6]	469	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	539		576		1,456		1,391
Net Income (Loss) Attributable to Noncontrolling Interest	2		0		7		11
Net Income (Loss) Attributable to Parent	537		576		1,449		1,380
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans	40,206		41,904		40,556		41,564
Segment Reporting Information Average Total Deposits	91,016		86,194		90,935		85,190
Average total assets	45,874		47,586		46,493		47,244
Average total liabilities	91,671		86,888		91,578		85,931
Average total equity	0		0		0		0
Net, interest income	688		666		2,029		1,957
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	688	[1]	666	[1]	2,029	[2]	1,957	[2]
Provision for Loan, Lease, and Other Losses	22	[3]	40	[3]	101	[4]	135	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	666		626		1,928		1,822
Total noninterest income	384		399		1,136		1,141
Noninterest Expense	720		720		2,167		2,154
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	330		305		897		809
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	123	[5]	112	[5]	334	[6]	297	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	207		193		563		512
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	207		193		563		512
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans	67,274		63,542		67,547		61,297
Segment Reporting Information Average Total Deposits	51,237		43,319		49,147		42,899
Average total assets	80,097		75,156		80,777		72,646
Average total liabilities	56,611		49,955		54,826		49,594
Average total equity	0		0		0		0
Net, interest income	447		419		1,321		1,220
FTE adjustment	35		34		103		102
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	482	[1]	453	[1]	1,424	[2]	1,322	[2]
Provision for Loan, Lease, and Other Losses	47	[3]	9	[3]	73	[4]	39	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	435		444		1,351		1,283
Total noninterest income	293		241		949		828
Noninterest Expense	388		367		1,189		1,180
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	340		318		1,111		931
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	109	[5]	94	[5]	371	[6]	296	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	231		224		740		635
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	231		224		740		635
Mortgage Banking
Segment Reporting Information Average Total Loans	25,299		25,261		24,847		27,106
Segment Reporting Information Average Total Deposits	2,918		2,664		2,754		2,260
Average total assets	29,280		30,447		28,595		31,078
Average total liabilities	3,290		3,085		3,139		2,763
Average total equity	0		0		0		0
Net, interest income	123		148		366		422
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	123	[1]	148	[1]	366	[2]	422	[2]
Provision for Loan, Lease, and Other Losses	(38)	[3]	44	[3]	(61)	[4]	94	[4]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	161		104		427		328
Total noninterest income	109		130		346		350
Noninterest Expense	154		166		511		717
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	116		68		262		(39)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	11	[5]	25	[5]	45	[6]	(16)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	105		43		217		(23)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	105		43		217		(23)
Corporate Other
Segment Reporting Information Average Total Loans	70		46		59		50
Segment Reporting Information Average Total Deposits	84		83		85		85
Average total assets	29,878		27,326		29,469		26,313
Average total liabilities	13,397		21,356		15,894		19,869
Average total equity	0		0		0		0
Net, interest income	40		70		103		220
FTE adjustment	1		1		2		2
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	41	[1]	71	[1]	105	[2]	222	[2]
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	41		71		105		222
Total noninterest income	29		14		84		222
Noninterest Expense	6		12		18		95
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	64		73		171		349
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	22	[5]	(108)	[5]	61	[6]	(41)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	42		181		110		390
Net Income (Loss) Attributable to Noncontrolling Interest	2		0		7		11
Net Income (Loss) Attributable to Parent	40		181		103		379
Reconciling Items
Segment Reporting Information Average Total Loans	(12)		(6)		(9)		(7)
Segment Reporting Information Average Total Deposits	(29)		(65)		(52)		(65)
Average total assets	3,212		2,918		3,301		2,817
Average total liabilities	(12)		(42)		(68)		(31)
Average total equity	23,384		22,191		23,266		21,972
Net, interest income	(87)		(88)		(301)		(190)
FTE adjustment	0		1		2		1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	(87)	[1]	(87)	[1]	(299)	[2]	(189)	[2]
Provision for Loan, Lease, and Other Losses	1	[3]	0		1	[4]	0
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(88)		(87)		(300)		(189)
Total noninterest income	(4)		(4)		(12)		(13)
Noninterest Expense	(4)		(6)		(13)		(12)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(88)		(85)		(299)		(190)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(42)	[5]	(20)	[5]	(125)	[6]	(67)	[6]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(46)		(65)		(174)		(123)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	$ (46)		$ (65)		$ (174)		$ (123)

[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.