Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net interest income	$ 3,557	$ 3,604	$ 3,354
Provision for loan and lease losses	423	1,538	3,543
Net interest income (loss) after provision for loan and lease losses	3,134	2,066	(189)
Noninterest income:
Mortgage banking net revenue	597	647	553
Service charges on deposits	520	574	632
Investment advisory revenue	375	361	326
Corporate banking revenue	350	364	372
Card and processing revenue	308	316	615
Gain on sale of processing business			1,758
Other noninterest income	250	406	479
Securities gains, net	46	47	(10)
Securities gains, net - non-qualifying hedges on mortgage servicing rights	9	14	57
Total noninterest income	2,455	2,729	4,782
Noninterest expense:
Salaries, wages and incentives	1,478	1,430	1,339
Employee benefits	330	314	311
Net occupancy expense	305	298	308
Technology and communications	188	189	181
Card and processing expense	120	108	193
Equipment expense	113	122	123
Other noninterest expense	1,224	1,394	1,371
Total noninterest expense	3,758	3,855	3,826
Income (loss) before income taxes	1,831	940	767
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	533	187	30
Net income (loss)	1,298	753	737
Less: Net income attributable to noncontrolling interest	(1)
Net income (loss)	1,297	753	737
Dividends on preferred stock	203	250	226
Net income available to common shareholders	1,094	503	511
Total goodwill	2,417	2,417	2,417
Total Assets	116,967	111,007	113,380
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,357	1,531	1,370
Provision for loan and lease losses	490	1,159	1,360
Net interest income (loss) after provision for loan and lease losses	867	372	10
Noninterest income:
Service charges on deposits	207	199	196
Investment advisory revenue	12	15	11
Corporate banking revenue	332	346	353
Card and processing revenue	38	33	28
Other noninterest income	52	42	20
Securities gains, net			1
Total noninterest income	641	635	609
Noninterest expense:
Salaries, wages and incentives	203	182	161
Employee benefits	37	32	31
Net occupancy expense	20	16	17
Technology and communications	11	14	6
Card and processing expense	5	2	1
Equipment expense	2	2	3
Other noninterest expense	795	723	741
Total noninterest expense	1,073	971	960
Income (loss) before income taxes	435	36	(341)
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	(6)	(142)	(240)
Net income (loss)	441	178	(101)
Net income (loss)	441	178	(101)
Net income available to common shareholders	441	178	(101)
Total goodwill	613	613	613
Total Assets	45,864	43,609	43,312
Branch Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,423	1,514	1,577
Provision for loan and lease losses	393	555	601
Net interest income (loss) after provision for loan and lease losses	1,030	959	976
Noninterest income:
Mortgage banking net revenue	11	27	26
Service charges on deposits	309	369	428
Investment advisory revenue	117	106	84
Corporate banking revenue	14	15	10
Card and processing revenue	305	298	268
Other noninterest income	81	70	86
Total noninterest income	837	885	902
Noninterest expense:
Salaries, wages and incentives	456	439	401
Employee benefits	127	121	106
Net occupancy expense	184	174	169
Technology and communications	5	16	16
Card and processing expense	114	105	70
Equipment expense	51	49	48
Other noninterest expense	642	652	563
Total noninterest expense	1,579	1,556	1,373
Income (loss) before income taxes	288	288	505
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	102	103	178
Net income (loss)	186	185	327
Net income (loss)	186	185	327
Net income available to common shareholders	186	185	327
Total goodwill	1,656	1,656	1,656
Total Assets	46,703	46,244	47,839
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Net interest income	343	405	476
Provision for loan and lease losses	261	569	558
Net interest income (loss) after provision for loan and lease losses	82	(164)	(82)
Noninterest income:
Mortgage banking net revenue	585	619	526
Service charges on deposits		1
Other noninterest income	36	36	40
Securities gains, net - non-qualifying hedges on mortgage servicing rights	9	14	57
Total noninterest income	630	670	623
Noninterest expense:
Salaries, wages and incentives	149	163	154
Employee benefits	34	31	27
Net occupancy expense	8	7	7
Technology and communications	1	2	2
Equipment expense	1	1	1
Other noninterest expense	433	342	318
Total noninterest expense	626	546	509
Income (loss) before income taxes	86	(40)	32
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	30	(14)	11
Net income (loss)	56	(26)	21
Net income (loss)	56	(26)	21
Net income available to common shareholders	56	(26)	21
Total Assets	24,325	22,604	20,923
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Net interest income	113	138	157
Provision for loan and lease losses	27	44	57
Net interest income (loss) after provision for loan and lease losses	86	94	100
Noninterest income:
Mortgage banking net revenue	1	2	1
Service charges on deposits	4	6	8
Investment advisory revenue	364	346	315
Corporate banking revenue	3	3	11
Card and processing revenue	4	1	1
Other noninterest income	(3)	(2)
Total noninterest income	373	356	336
Noninterest expense:
Salaries, wages and incentives	138	131	117
Employee benefits	26	25	23
Net occupancy expense	11	9	10
Technology and communications	1	2	2
Equipment expense	1	1	1
Other noninterest expense	244	237	201
Total noninterest expense	421	405	354
Income (loss) before income taxes	38	45	82
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	14	16	29
Net income (loss)	24	29	53
Net income (loss)	24	29	53
Net income available to common shareholders	24	29	53
Total goodwill	148	148	148
Total Assets	7,670	6,759	6,057
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net interest income	321	16	(226)
Provision for loan and lease losses	(748)	(789)	967
Net interest income (loss) after provision for loan and lease losses	1,069	805	(1,193)
Noninterest income:
Mortgage banking net revenue		(1)
Service charges on deposits		(1)
Investment advisory revenue	(1)		(1)
Corporate banking revenue	1		(2)
Card and processing revenue	(39)	(16)	357
Gain on sale of processing business			1,758
Other noninterest income	84	260	333
Securities gains, net	46	47	(11)
Total noninterest income	91	289	2,434
Noninterest expense:
Salaries, wages and incentives	532	515	506
Employee benefits	106	105	124
Net occupancy expense	82	92	105
Technology and communications	170	155	155
Card and processing expense	1	1	122
Equipment expense	58	175	70
Other noninterest expense	(773)	(560)	(330)
Total noninterest expense	176	483	752
Income (loss) before income taxes	984	611	489
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	393	224	52
Net income (loss)	591	387	437
Less: Net income attributable to noncontrolling interest	(1)
Net income (loss)	590	387	437
Dividends on preferred stock	203	250	226
Net income available to common shareholders	387	137	211
Total Assets	(7,595)	(8,209)	(4,751)
Business Intersegment, Eliminations
Noninterest income:
Investment advisory revenue	(117)	(106)	(83)
Card and processing revenue			(39)	[1]
Total noninterest income	(117)	(106)	(122)
Noninterest expense:
Equipment expense		(106)
Other noninterest expense	(117)		(122)
Total noninterest expense	$ (117)	$ (106)	$ (122)

[1]  Card and processing revenues provided to the banking segments are eliminated in the Consolidated Statements of Income.