Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net interest income	$ 902	$ 916	$ 2,655	$ 2,703
Provision for loan and lease losses	87	457	368	1,372
Net interest income (loss) after provision for loan and lease losses	815	459	2,287	1,331
Noninterest income:
Mortgage Servicing And Other	178	232	442	498
Service charges on deposits	134	143	384	435
Investment advisory revenue	92	90	285	267
Corporate banking revenue	87	86	268	260
Card and processing revenue	78	77	248	235
Other noninterest income	64	195	226	354
Securities gains, net			40
Securities gains, net - non-qualifying hedges on mortgage servicing rights			12
Total noninterest income	665	827	1,905	2,074
Noninterest expense:
Salaries, wages and incentives	369	360	1,085	1,046
Employee benefits	70	82	246	241
Net occupancy expense	75	72	226	222
Technology and communications	48	48	140	138
Card and processing expense	34	26	92	82
Equipment expense	28	30	85	91
Other noninterest expense	322	361	891	1,049
Total noninterest expense	946	979	2,765	2,869
Income (loss) before income taxes	534	307	1,427	536
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	153	69	443	116
Net Income (Loss)	381	238	984	420
Less: Net income attributable to noncontrolling interest			1
Net income (loss) attributable to Bancorp	381	238	983	420
Dividends on preferred stock	8	63	194	187
Net income (loss) available to common shareholders	373	175	789	233
Total goodwill	2,417	2,417	2,417	2,417	2,417	2,417
Total Assets	114,905	112,322	114,905	112,322	111,007
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	345	389	1,015	1,156
Provision for loan and lease losses	104	559	402	1,025
Net interest income (loss) after provision for loan and lease losses	241	(170)	613	131
Noninterest income:
Service charges on deposits	53	50	154	145
Investment advisory revenue	3	5	9	11
Corporate banking revenue	82	81	254	248
Card and processing revenue	10	9	29	25
Other noninterest income	11	(6)	51	36
Total noninterest income	159	139	497	465
Noninterest expense:
Salaries, wages and incentives	60	52	170	156
Employee benefits	9	7	35	29
Net occupancy expense	5	4	15	12
Technology and communications	2	4	8	10
Card and processing expense	1		4	1
Equipment expense	1	1	2	2
Other noninterest expense	184	178	581	515
Total noninterest expense	262	246	815	725
Income (loss) before income taxes	138	(277)	295	(129)
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	10	(132)	(7)	(152)
Net Income (Loss)	128	(145)	302	23
Net income (loss) attributable to Bancorp	128	(145)	302	23
Net income (loss) available to common shareholders	128	(145)	302	23
Total goodwill	613	613	613	613	613	613
Total Assets	44,622	43,403	44,622	43,403
Branch Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	359	384	1,057	1,155
Provision for loan and lease losses	87	153	300	436
Net interest income (loss) after provision for loan and lease losses	272	231	757	719
Noninterest income:
Mortgage Servicing And Other	3	8	6	18
Service charges on deposits	81	92	228	285
Investment advisory revenue	30	27	89	78
Corporate banking revenue	4	4	11	11
Card and processing revenue	78	73	241	220
Other noninterest income	19	18	57	54
Total noninterest income	215	222	632	666
Noninterest expense:
Salaries, wages and incentives	115	110	344	327
Employee benefits	31	27	100	88
Net occupancy expense	46	43	138	130
Technology and communications	1	4	4	12
Card and processing expense	33	26	88	80
Equipment expense	13	12	38	37
Other noninterest expense	160	167	480	489
Total noninterest expense	399	389	1,192	1,163
Income (loss) before income taxes	88	64	197	222
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	31	25	69	83
Net Income (Loss)	57	39	128	139
Net income (loss) attributable to Bancorp	57	39	128	139
Net income (loss) available to common shareholders	57	39	128	139
Total goodwill	1,656	1,656	1,656	1,656	1,656	1,656
Total Assets	46,727	46,479	46,727	46,479
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Net interest income	85	102	256	299
Provision for loan and lease losses	55	232	205	478
Net interest income (loss) after provision for loan and lease losses	30	(130)	51	(179)
Noninterest income:
Mortgage Servicing And Other	175	224	435	479
Other noninterest income	10	6	26	26
Securities gains, net - non-qualifying hedges on mortgage servicing rights	6
Total noninterest income	191	230	473	505
Noninterest expense:
Salaries, wages and incentives	37	44	101	113
Employee benefits	8	7	26	22
Net occupancy expense	2	2	6	5
Technology and communications		1	1	1
Equipment expense			1	1
Other noninterest expense	111	91	319	249
Total noninterest expense	158	145	454	391
Income (loss) before income taxes	63	(45)	70	(65)
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	22	(18)	24	(28)
Net Income (Loss)	41	(27)	46	(37)
Net income (loss) attributable to Bancorp	41	(27)	46	(37)
Net income (loss) available to common shareholders	41	(27)	46	(37)
Total Assets	23,213	22,227	23,213	22,227
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Net interest income	29	35	85	109
Provision for loan and lease losses	16	12	25	33
Net interest income (loss) after provision for loan and lease losses	13	23	60	76
Noninterest income:
Mortgage Servicing And Other			1	1
Service charges on deposits	1	1	3	5
Investment advisory revenue	89	85	275	256
Corporate banking revenue	1	2	2	2
Card and processing revenue	1		3	2
Total noninterest income	92	88	284	266
Noninterest expense:
Salaries, wages and incentives	34	33	104	95
Employee benefits	6	5	21	19
Net occupancy expense	3	2	8	7
Technology and communications			1	2
Equipment expense			1	1
Other noninterest expense	62	60	181	173
Total noninterest expense	105	100	316	297
Income (loss) before income taxes		11	28	45
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment		4	10	16
Net Income (Loss)		7	18	29
Net income (loss) attributable to Bancorp		7	18	29
Net income (loss) available to common shareholders		7	18	29
Total goodwill	148	148	148	148	148	148
Total Assets	7,358	6,296	7,358	6,296
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Net interest income	84	6	242	(16)
Provision for loan and lease losses	(175)	(499)	(564)	(600)
Net interest income (loss) after provision for loan and lease losses	259	505	806	584
Noninterest income:
Service charges on deposits	(1)	0	(1)
Corporate banking revenue		(1)	1	(1)
Card and processing revenue	(11)	(5)	(25)	(12)
Other noninterest income	24	177	92	238
Securities gains, net	26	4		25
Total noninterest income	38	175	107	250
Noninterest expense:
Salaries, wages and incentives	123	121	366	355
Employee benefits	16	36	64	83
Net occupancy expense	19	21	59	68
Technology and communications	45	39	126	113
Card and processing expense				1
Equipment expense	14	17	43	50
Other noninterest expense	(165)	(108)	(582)	(299)
Total noninterest expense	52	126	76	371
Income (loss) before income taxes	245	554	837	463
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	90	190	347	197
Net Income (Loss)	155	364	490	266
Less: Net income attributable to noncontrolling interest			(1)
Net income (loss) attributable to Bancorp	155	364	489	266
Dividends on preferred stock	8	63	194	187
Net income (loss) available to common shareholders	147	301	295	79
Total Assets	(7,015)	(6,083)	(7,015)	(6,083)
Business Intersegment, Eliminations
Noninterest income:
Investment advisory revenue	(30)	(27)	(88)	(78)
Total noninterest income	(30)	(27)	(88)	(78)
Noninterest expense:
Other noninterest expense	(30)	(27)	(88)	(78)
Total noninterest expense	$ (30)	$ (27)	$ (88)	$ (78)