Business Segment Reporting (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 segments		Sep. 30, 2013
Segment Reporting Information Average Total Loans	$ 130,747		$ 122,672		$ 130,010		$ 121,649
Segment Reporting Information Average Total Deposits	132,195		126,618		130,369		126,947
Number of Operating Segments					3
Average total assets	183,433		171,838		180,098		172,061
Average total liabilities	161,242		150,811		158,126		150,923
Average total equity	22,191		21,027		21,972		21,138
Net, interest income	1,215		1,208		3,629		3,640
FTE adjustment	36		32		105		93
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	1,251	[1]	1,240	[1]	3,734	[1]	3,733	[1]
Provision for Loan, Lease, and Other Losses	93	[2]	95	[2]	268	[2]	453	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	1,158		1,145		3,466		3,280
Total noninterest income	780		680		2,528		2,401
Noninterest Expense	1,259		1,730		4,134		4,470
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	679		95		1,860		1,211
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	103	[3]	(101)	[3]	469	[4]	277	[4]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	576		196		1,391		934
Net Income (Loss) Attributable to Noncontrolling Interest	0		7		11		16
Net Income (Loss) Attributable to Parent	576		189		1,380		918
Consumer Banking and Private Wealth Management [Member]
Segment Reporting Information Average Total Loans	41,893		40,529		41,553		40,360
Segment Reporting Information Average Total Deposits	86,468		84,159		85,456		84,447
Average total assets	47,338		45,576		47,154		45,398
Average total liabilities	87,167		84,999		86,202		85,277
Average total equity	0		0		0		0
Net, interest income	668		653		1,963		1,945
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	668	[1]	653	[1]	1,963	[1]	1,945	[1]
Provision for Loan, Lease, and Other Losses	40	[2]	23	[2]	135	[2]	201	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	628		630		1,828		1,744
Total noninterest income	399		378		1,142		1,105
Noninterest Expense	725		691		2,170		2,088
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	302		317		800		761
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	111	[3]	117	[3]	294	[4]	280	[4]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	191		200		506		481
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	191		200		506		481
Wholesale Banking [Member]
Segment Reporting Information Average Total Loans	63,552		54,185		61,307		53,413
Segment Reporting Information Average Total Deposits	43,144		39,269		42,750		39,030
Average total assets	75,137		66,038		72,647		65,592
Average total liabilities	49,775		46,368		49,440		46,253
Average total equity	0		0		0		0
Net, interest income	423		392		1,234		1,165
FTE adjustment	34		31		102		90
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	457	[1]	423	[1]	1,336	[1]	1,255	[1]
Provision for Loan, Lease, and Other Losses	9	[2]	52	[2]	39	[2]	120	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	448		371		1,297		1,135
Total noninterest income	241		248		827		795
Noninterest Expense	363		381		1,168		1,085
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	326		238		956		845
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	97	[3]	75	[3]	305	[4]	275	[4]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	229		163		651		570
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	229		163		651		570
Mortgage Banking
Segment Reporting Information Average Total Loans	25,262		27,920		27,106		27,830
Segment Reporting Information Average Total Deposits	2,664		3,247		2,260		3,501
Average total assets	30,414		33,025		31,067		32,973
Average total liabilities	3,085		3,740		2,763		4,166
Average total equity	0		0		0		0
Net, interest income	148		141		422		409
FTE adjustment	0		0		0		0
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	148	[1]	141	[1]	422	[1]	409	[1]
Provision for Loan, Lease, and Other Losses	44	[2]	20	[2]	94	[2]	133	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	104		121		328		276
Total noninterest income	130		(1)		350		328
Noninterest Expense	166		638		717		1,248
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	68		(518)		(39)		(644)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	25	[3]	(129)	[3]	(16)	[4]	(181)	[4]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	43		(389)		(23)		(463)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	43		(389)		(23)		(463)
Corporate Other
Segment Reporting Information Average Total Loans	40		38		44		46
Segment Reporting Information Average Total Deposits	(81)		(57)		(97)		(31)
Average total assets	27,627		26,116		26,413		26,737
Average total liabilities	21,256		15,716		19,751		15,314
Average total equity	0		0		0		0
Net, interest income	70		76		218		238
FTE adjustment	1		1		2		2
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	71	[1]	77	[1]	220	[1]	240	[1]
Provision for Loan, Lease, and Other Losses	0	[2]	0	[2]	0	[2]	(1)	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	71		77		220		241
Total noninterest income	14		57		222		179
Noninterest Expense	11		22		91		58
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	74		112		351		362
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(107)	[3]	(160)	[3]	(40)	[4]	(83)	[4]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	181		272		391		445
Net Income (Loss) Attributable to Noncontrolling Interest	0		7		11		16
Net Income (Loss) Attributable to Parent	181		265		380		429
Reconciling Items
Segment Reporting Information Average Total Loans	0		0		0		0
Segment Reporting Information Average Total Deposits	0		0		0		0
Average total assets	2,917		1,083		2,817		1,361
Average total liabilities	(41)		(12)		(30)		(87)
Average total equity	22,191		21,027		21,972		21,138
Net, interest income	(94)		(54)		(208)		(117)
FTE adjustment	1		0		1		1
Segment Reporting Information Net Interest Income Including Fully Taxable Equivalent Adjustment	(93)	[1]	(54)	[1]	(207)	[1]	(116)	[1]
Provision for Loan, Lease, and Other Losses	0	[2]	0	[2]	0	[2]	0	[2]
Segment Reporting Information Net Interest Income After Provision For Credit Losses and Taxable Equivalent Adjustment	(93)		(54)		(207)		(116)
Total noninterest income	(4)		(2)		(13)		(6)
Noninterest Expense	(6)		(2)		(12)		(9)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(91)		(54)		(208)		(113)
Income Tax Expense (Benefit) Including Fully Taxable Equivalent Adjustment Reversal	(23)	[3]	(4)	[3]	(74)	[4]	(14)	[4]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(68)		(50)		(134)		(99)
Net Income (Loss) Attributable to Noncontrolling Interest	0		0		0		0
Net Income (Loss) Attributable to Parent	$ (68)		$ (50)		$ (134)		$ (99)

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

[2] Provision for credit losses represents net charge-offs by segment combined with an allocation to the segments of the provision attributable to quarterly changes in the allowance for loan and lease losses and unfunded commitment reserve balances.

[3] Includes regular income tax provision/(benefit) and taxable-equivalent income adjustment reversal. Nine Months Ended September 30, 2014(Dollars in millions)ConsumerBanking andPrivate WealthManagement Wholesale Banking Mortgage Banking Corporate Other ReconcilingItems ConsolidatedBalance Sheets: Average loans$41,553 $61,307 $27,106 $44 $— $130,010Average consumer and commercial deposits85,456 42,750 2,260 (97) — 130,369Average total assets47,154 72,647 31,067 26,413 2,817 180,098Average total liabilities86,202 49,440 2,763 19,751 (30) 158,126Average total equity— — — — 21,972 21,972 Statements of Income/(Loss): Net interest income$1,963 $1,234 $422 $218 ($208) $3,629FTE adjustment— 102 — 2 1 105Net interest income - FTE 11,963 1,336 422 220 (207) 3,734Provision for credit losses 2135 39 94 — — 268Net interest income after provision for credit losses1,828 1,297 328 220 (207) 3,466Total noninterest income1,142 827 350 222 (13) 2,528Total noninterest expense2,170 1,168 717 91 (12) 4,134Income/(loss) before provision/(benefit) for income taxes800 956 (39) 351 (208) 1,860Provision/(benefit) for income taxes 3294 305 (16) (40) (74) 469Net income/(loss) including income attributable to noncontrolling interest506 651 (23) 391 (134) 1,391Net income attributable to noncontrolling interest— — — 11 — 11Net income/(loss)$506 $651 ($23) $380 ($134) $1,380

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