Loans and Allowance for Credit Losses (Details 3) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	$ 5,498		$ 5,531
Provision for credit losses	572	1,139	1,327	2,449
Loans charged off	850		1,749
Less recoveries of loans charged off	(103)		(197)
Net loans charged off	747		1,552
Net change for credit losses to be reimbursed by the FDIC	(15)		2
Balance at end of year	5,308		5,308
Allowance balance at end of year related to:
Loans individually evaluated for impairment	81		81		93
TDRs collectively evaluated for impairment	638		638		573
Other loans collectively evaluated for impairment	4,494		4,494		4,778
Loans acquired with deteriorated credit quality	95		95		87
Total allowance for credit losses	5,308		5,308		5,531
Loan balance at end of year:
Loans individually evaluated for impairment	1,071		1,071		1,096
TDRs collectively evaluated for impairment	2,751		2,751		2,523
Other loans collectively evaluated for impairment	189,723		189,723		187,239
Loans acquired with deteriorated credit quality	6,337		6,337		6,203
Total loans	199,882		199,882		197,061
Commercial Loan [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	1,139		1,104
Provision for credit losses	66		240
Loans charged off	125		286
Less recoveries of loans charged off	(29)		(51)
Net loans charged off	96		235
Net change for credit losses to be reimbursed by the FDIC	0		0
Balance at end of year	1,109		1,109
Allowance balance at end of year related to:
Loans individually evaluated for impairment	13		13		38
TDRs collectively evaluated for impairment	30		30		0
Other loans collectively evaluated for impairment	1,066		1,066		1,066
Loans acquired with deteriorated credit quality	0		0		0
Total allowance for credit losses	1,109		1,109		1,104
Loan balance at end of year:
Loans individually evaluated for impairment	140		140		295
TDRs collectively evaluated for impairment	61		61		0
Other loans collectively evaluated for impairment	50,334		50,334		48,103
Loans acquired with deteriorated credit quality	15		15		0
Total loans	50,550		50,550		48,398
Commercial Real Estate Loans [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	1,275		1,291
Provision for credit losses	147		256
Loans charged off	175		315
Less recoveries of loans charged off	(11)		(26)
Net loans charged off	164		289
Net change for credit losses to be reimbursed by the FDIC	0		0
Balance at end of year	1,258		1,258
Allowance balance at end of year related to:
Loans individually evaluated for impairment	68		68		55
TDRs collectively evaluated for impairment	0		0		0
Other loans collectively evaluated for impairment	1,188		1,188		1,235
Loans acquired with deteriorated credit quality	2		2		1
Total allowance for credit losses	1,258		1,258		1,291
Loan balance at end of year:
Loans individually evaluated for impairment	931		931		801
TDRs collectively evaluated for impairment	0		0		0
Other loans collectively evaluated for impairment	34,325		34,325		33,834
Loans acquired with deteriorated credit quality	234		234		60
Total loans	35,490		35,490		34,695
Residential Mortgage [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	819		820
Provision for credit losses	141		269
Loans charged off	123		256
Less recoveries of loans charged off	(4)		(8)
Net loans charged off	119		248
Net change for credit losses to be reimbursed by the FDIC	0		0
Balance at end of year	841		841
Allowance balance at end of year related to:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	341		341		320
Other loans collectively evaluated for impairment	500		500		500
Loans acquired with deteriorated credit quality	0		0		0
Total allowance for credit losses	841		841		820
Loan balance at end of year:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	2,100		2,100		1,957
Other loans collectively evaluated for impairment	30,998		30,998		28,775
Loans acquired with deteriorated credit quality	12		12		0
Total loans	33,110		33,110		30,732
Credit Card [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	1,276		1,395
Provision for credit losses	80		208
Loans charged off	241		509
Less recoveries of loans charged off	(25)		(46)
Net loans charged off	216		463
Net change for credit losses to be reimbursed by the FDIC	0		0
Balance at end of year	1,140		1,140
Allowance balance at end of year related to:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	218		218		223
Other loans collectively evaluated for impairment	922		922		1,172
Loans acquired with deteriorated credit quality	0		0		0
Total allowance for credit losses	1,140		1,140		1,395
Loan balance at end of year:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	468		468		452
Other loans collectively evaluated for impairment	15,643		15,643		16,351
Loans acquired with deteriorated credit quality	0		0		0
Total loans	16,111		16,111		16,803
Other Retail Excluding Credit Cards [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	854		807
Provision for credit losses	136		346
Loans charged off	181		376
Less recoveries of loans charged off	(34)		(66)
Net loans charged off	147		310
Net change for credit losses to be reimbursed by the FDIC	0		0
Balance at end of year	843		843
Allowance balance at end of year related to:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	49		49		30
Other loans collectively evaluated for impairment	794		794		777
Loans acquired with deteriorated credit quality	0		0		0
Total allowance for credit losses	843		843		807
Loan balance at end of year:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	122		122		114
Other loans collectively evaluated for impairment	48,098		48,098		48,277
Loans acquired with deteriorated credit quality	0		0		0
Total loans	48,220		48,220		48,391
Total Loans, Excluding Covered Loans [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	5,363		5,417
Provision for credit losses	570		1,319
Loans charged off	845		1,742
Less recoveries of loans charged off	(103)		(197)
Net loans charged off	742		1,545
Net change for credit losses to be reimbursed by the FDIC	0		0
Balance at end of year	5,191		5,191
Allowance balance at end of year related to:
Loans individually evaluated for impairment	81		81		93
TDRs collectively evaluated for impairment	638		638		573
Other loans collectively evaluated for impairment	4,470		4,470		4,750
Loans acquired with deteriorated credit quality	2		2		1
Total allowance for credit losses	5,191		5,191		5,417
Loan balance at end of year:
Loans individually evaluated for impairment	1,071		1,071		1,096
TDRs collectively evaluated for impairment	2,751		2,751		2,523
Other loans collectively evaluated for impairment	179,398		179,398		175,340
Loans acquired with deteriorated credit quality	261		261		60
Total loans	183,481		183,481		179,019
Covered Loans [Member]
Additional detail of the allowance for credit losses and related loan balances, by portfolio type
Balance at beginning of year	135		114
Provision for credit losses	2		8
Loans charged off	5		7
Less recoveries of loans charged off	0		0
Net loans charged off	5		7
Net change for credit losses to be reimbursed by the FDIC	(15)		2
Balance at end of year	117		117
Allowance balance at end of year related to:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	0		0		0
Other loans collectively evaluated for impairment	24		24		28
Loans acquired with deteriorated credit quality	93		93		86
Total allowance for credit losses	117		117		114
Loan balance at end of year:
Loans individually evaluated for impairment	0		0		0
TDRs collectively evaluated for impairment	0		0		0
Other loans collectively evaluated for impairment	10,325		10,325		11,899
Loans acquired with deteriorated credit quality	6,076		6,076		6,143
Total loans	$ 16,401		$ 16,401		$ 18,042