Loans and Leases and Allowance for Credit Losses (Details 2) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	$ 1,071,126		$ 1,249,008
Recoveries of loans previously charged-off	25,344		90,435
Loan charge-offs	(115,899)		(443,607)
Provision for loan and lease losses	45,867		132,116
Allowance for loans sold or transferred to hoans held for sale	(6,728)		(8,242)
ALLL balance, end of period	1,019,710		1,019,710		1,249,008
AULC balance, beginning of period	41,060		42,127
Provision for unfunded loan commitments and letters of credit	(2,281)		(3,348)
AULC Balance, end of period	38,779		38,779
ACL balance, end of period	1,058,489		1,058,489
Loan and lease balances by credit quality indicator
Total commercial and industrial	13,938,885		13,938,885		13,063,293		12,424,529
Total commercial real estate	5,934,444		5,934,444		6,651,156		6,912,573
Automobile	5,558,415	[1]	5,558,415	[1]	5,614,711	[1]	5,385,196
Home equity	8,078,887		8,078,887		7,713,154		7,689,420
Residential mortgage	4,986,023	[1]	4,986,023	[1]	4,500,366	[1]	4,511,272
Other consumer	515,240	[1]	515,240	[1]	563,827	[1]	577,597
Commercial and industrial owner occupied [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	3,978,031		3,978,031		3,823,463
Commercial and industrial owner occupied [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	3,531,028		3,531,028		3,265,266
Commercial and industrial owner occupied [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	108,665		108,665		159,398
Commercial and industrial owner occupied [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	337,037		337,037		392,969
Commercial and industrial owner occupied [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	1,301		1,301		5,830
Other commercial and industrial [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	9,960,854		9,960,854		9,239,830
Other commercial and industrial [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	9,318,615		9,318,615		8,434,969
Other commercial and industrial [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	204,594		204,594		264,679
Other commercial and industrial [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	432,760		432,760		524,867
Other commercial and industrial [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	4,885		4,885		15,315
Commercial and Industrial [Member]
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	281,016		340,614
Recoveries of loans previously charged-off	10,733		31,804
Loan charge-offs	(28,624)		(110,590)
Provision for loan and lease losses	22,129		23,426
Allowance for loans sold or transferred to hoans held for sale	0		0
ALLL balance, end of period	285,254		285,254		340,614
AULC balance, beginning of period	31,341		32,726
Provision for unfunded loan commitments and letters of credit	(882)		(2,267)
AULC Balance, end of period	30,459		30,459
ACL balance, end of period	315,713		315,713
Commercial real estate retail properties [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	1,648,540		1,648,540		1,762,217
Commercial real estate retail properties [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	1,303,839		1,303,839		1,283,667
Commercial real estate retail properties [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	133,512		133,512		128,067
Commercial real estate retail properties [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	211,189		211,189		350,478
Commercial real estate retail properties [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	0		0		5
Commercial real estate Multi family [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	1,004,314		1,004,314		1,121,616
Commercial real estate Multi family [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	849,886		849,886		898,935
Commercial real estate Multi family [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	52,630		52,630		78,577
Commercial real estate Multi family [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	101,548		101,548		143,689
Commercial real estate Multi family [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	250		250		415
Commercial real estate office [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	1,011,241		1,011,241		1,123,127
Commercial real estate office [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	849,981		849,981		867,970
Commercial real estate office [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	91,098		91,098		122,173
Commercial real estate office [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	70,034		70,034		132,833
Commercial real estate office [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	128		128		151
Commercial real estate Industrial and warehouse [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	733,997		733,997		852,952
Commercial real estate Industrial and warehouse [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	634,183		634,183		668,452
Commercial real estate Industrial and warehouse [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	26,074		26,074		72,177
Commercial real estate Industrial and warehouse [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	73,740		73,740		112,323
Commercial real estate Industrial and warehouse [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	0		0		0
Other commercial real estate [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	1,536,352		1,536,352		1,791,244
Other commercial real estate [Member] | Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	1,094,653		1,094,653		1,220,708
Other commercial real estate [Member] | OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	107,116		107,116		88,288
Other commercial real estate [Member] | Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	333,876		333,876		481,136
Other commercial real estate [Member] | Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial real estate	707		707		1,112
Commercial Real Estate [Member]
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	463,874		588,251
Recoveries of loans previously charged-off	5,181		27,273
Loan charge-offs	(29,621)		(146,991)
Provision for loan and lease losses	(20,539)		(49,638)
Allowance for loans sold or transferred to hoans held for sale	0		0
ALLL balance, end of period	418,895		418,895		588,251
AULC balance, beginning of period	6,632		6,158
Provision for unfunded loan commitments and letters of credit	(1,316)		(842)
AULC Balance, end of period	5,316		5,316
ACL balance, end of period	424,211		424,211
Automobile Loan [Member]
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	55,428		49,488
Recoveries of loans previously charged-off	4,224		14,109
Loan charge-offs	(8,087)		(24,939)
Provision for loan and lease losses	4,565		17,472
Allowance for loans sold or transferred to hoans held for sale	(6,728)		(6,728)
ALLL balance, end of period	49,402		49,402		49,488
AULC balance, beginning of period	0		0
Provision for unfunded loan commitments and letters of credit	0		0
AULC Balance, end of period	0		0
ACL balance, end of period	49,402		49,402
Home Equity [Member]
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	146,444		150,630
Recoveries of loans previously charged-off	1,694		5,220
Loan charge-offs	(27,916)		(83,598)
Provision for loan and lease losses	19,394		67,364
Allowance for loans sold or transferred to hoans held for sale	0		0
ALLL balance, end of period	139,616		139,616		150,630
AULC balance, beginning of period	2,249		2,348
Provision for unfunded loan commitments and letters of credit	(67)		(166)
AULC Balance, end of period	2,182		2,182
ACL balance, end of period	141,798		141,798
Home equity secured by first-lien other [Member]
Loan and lease balances by credit quality indicator
Home equity	3,588,764	[1]	3,588,764	[1]	3,040,752	[1]
Home equity secured by first-lien other [Member] | 750+[Member]
Loan and lease balances by credit quality indicator
Home equity	2,039,431	[1]	2,039,431	[1]	1,643,792	[1]
Home equity secured by first-lien other [Member] | 650-749 [Member]
Loan and lease balances by credit quality indicator
Home equity	1,219,344	[1]	1,219,344	[1]	1,082,143	[1]
Home equity secured by first-lien other [Member] | Less than 650 [Member]
Loan and lease balances by credit quality indicator
Home equity	318,745	[1]	318,745	[1]	313,961	[1]
Home equity secured by first-lien other [Member] | Other (2) [Member]
Loan and lease balances by credit quality indicator
Home equity	11,244	[1],[2]	11,244	[1],[2]	856	[1],[2]
Home equity Secured by second-lien [Member]
Loan and lease balances by credit quality indicator
Home equity	4,490,123	[1]	4,490,123	[1]	4,672,402	[1]
Home equity Secured by second-lien [Member] | 750+[Member]
Loan and lease balances by credit quality indicator
Home equity	2,168,899	[1]	2,168,899	[1]	2,224,545	[1]
Home equity Secured by second-lien [Member] | 650-749 [Member]
Loan and lease balances by credit quality indicator
Home equity	1,686,926	[1]	1,686,926	[1]	1,768,450	[1]
Home equity Secured by second-lien [Member] | Less than 650 [Member]
Loan and lease balances by credit quality indicator
Home equity	633,704	[1]	633,704	[1]	678,738	[1]
Home equity Secured by second-lien [Member] | Other (2) [Member]
Loan and lease balances by credit quality indicator
Home equity	594	[1],[2]	594	[1],[2]	669	[1],[2]
Residential Mortgage [Member]
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	98,992		93,289
Recoveries of loans previously charged-off	1,860		6,824
Loan charge-offs	(13,422)		(53,773)
Provision for loan and lease losses	11,544		54,148
Allowance for loans sold or transferred to hoans held for sale	0		(1,514)
ALLL balance, end of period	98,974		98,974		93,289
AULC balance, beginning of period	1		1
Provision for unfunded loan commitments and letters of credit	0		0
AULC Balance, end of period	1		1
ACL balance, end of period	98,975		98,975
Other Consumer loan [Member]
Allowance For Credit Losses Roll Forward [Abstract]
ALLL balance, beginning of period	25,372		26,736
Recoveries of loans previously charged-off	1,652		5,205
Loan charge-offs	(8,229)		(23,716)
Provision for loan and lease losses	8,774		19,344
Allowance for loans sold or transferred to hoans held for sale	0		0
ALLL balance, end of period	27,569		27,569		26,736
AULC balance, beginning of period	837		894
Provision for unfunded loan commitments and letters of credit	(16)		(73)
AULC Balance, end of period	821		821
ACL balance, end of period	28,390		28,390
Pass [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	12,849,643		12,849,643		11,700,235
Total commercial real estate	4,732,542		4,732,542		4,939,732
OLEM [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	313,259		313,259		424,077
Total commercial real estate	410,430		410,430		489,282
Substandard [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	769,797		769,797		917,836
Total commercial real estate	790,387		790,387		1,220,459
Doubtful [Member]
Loan and lease balances by credit quality indicator
Total commercial and industrial	6,186		6,186		21,145
Total commercial real estate	1,085		1,085		1,683
750+[Member]
Loan and lease balances by credit quality indicator
Automobile	2,552,438	[1]	2,552,438	[1]	2,516,130	[1]
Residential mortgage	2,301,637	[1]	2,301,637	[1]	1,978,843	[1]
Other consumer	196,729	[1]	196,729	[1]	206,952	[1]
650-749 [Member]
Loan and lease balances by credit quality indicator
Automobile	2,200,114	[1]	2,200,114	[1]	2,267,363	[1]
Residential mortgage	1,731,554	[1]	1,731,554	[1]	1,580,266	[1]
Other consumer	212,512	[1]	212,512	[1]	234,558	[1]
Less than 650 [Member]
Loan and lease balances by credit quality indicator
Automobile	697,307	[1]	697,307	[1]	724,584	[1]
Residential mortgage	718,477	[1]	718,477	[1]	795,676	[1]
Other consumer	84,725	[1]	84,725	[1]	102,254	[1]
Other (2) [Member]
Loan and lease balances by credit quality indicator
Automobile	108,556	[1],[2]	108,556	[1],[2]	106,634	[1],[2]
Residential mortgage	234,355	[1],[2]	234,355	[1],[2]	145,581	[1],[2]
Other consumer	$ 21,274	[1],[2]	$ 21,274	[1],[2]	$ 20,063	[1],[2]

[1] Reflects currently updated customer credit scores.

[2] Reflects deferred fees and costs, loans in process, loans to legal entities, etc.