Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters of Credit (Rollforward of Allowance For Loan and Lease Losses and Associated Loan Data) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Dec. 31, 2010
Beginning Balance	$ 4,887	[1]	$ 5,072
Charge-offs	(1,782)		(2,568)
Recoveries	470		423
Net charge-offs	(1,312)		(2,145)
Provision for credit losses	962		2,060
Adoption of ASU 2009-17, Consolidations			141
Other	(1)
Net change in allowance for unfunded loan commitments and letters of credit	(29)		103
Ending Balance	4,507	[1]	5,231
TDRs individually evaluated for impairment - associated allowance	539		441
Other loans individually evaluated for impairment - associated allowance	583		959
Loans collectively evaluated for impairment - associated allowance	2,399		2,925
Purchased impaired loans - associated allowance	986		906
TDRs individually evaluated for impairment	2,147		1,334
Other loans individually evaluated for impairment	2,076		3,446
Loans collectively evaluated for impairment	143,393		137,217
Purchased impaired loans	6,927		8,130	7,780
Total Loans	154,543	[1],[2],[3],[4]	150,127	150,595	[1],[2],[3],[4]
Ratio of the allowance for loan and lease losses to total loans	2.92%		3.48%
Segment ALLL as a percentage of total ALLL	100.00%		100.00%
TOTAL COMMERCIAL LENDING [Member]
Beginning Balance	2,567		3,345
Charge-offs	(959)		(1,476)
Recoveries	358		318
Net charge-offs	(601)		(1,158)
Provision for credit losses	268		660
Other	(1)
Net change in allowance for unfunded loan commitments and letters of credit	(13)		103
Ending Balance	2,220		2,950
TDRs individually evaluated for impairment - associated allowance	28		16
Other loans individually evaluated for impairment - associated allowance	583		959
Loans collectively evaluated for impairment - associated allowance	1,366		1,627
Purchased impaired loans - associated allowance	243		348
TDRs individually evaluated for impairment	396		108
Other loans individually evaluated for impairment	2,076		3,446
Loans collectively evaluated for impairment	81,420		73,574
Purchased impaired loans	957		1,559
Total Loans	84,849		78,687
Ratio of the allowance for loan and lease losses to total loans	2.62%		3.75%
Segment ALLL as a percentage of total ALLL	49.26%		56.39%
TOTAL CONSUMER LENDING [Member]
Beginning Balance	2,320		1,727
Charge-offs	(823)		(1,092)
Recoveries	112		105
Net charge-offs	(711)		(987)
Provision for credit losses	694		1,400
Adoption of ASU 2009-17, Consolidations			141
Net change in allowance for unfunded loan commitments and letters of credit	(16)
Ending Balance	2,287		2,281
TDRs individually evaluated for impairment - associated allowance	511		425
Loans collectively evaluated for impairment - associated allowance	1,033		1,298
Purchased impaired loans - associated allowance	743		558
TDRs individually evaluated for impairment	1,751		1,226
Loans collectively evaluated for impairment	61,973		63,643
Purchased impaired loans	5,970		6,571
Total Loans	$ 69,694		$ 71,440
Ratio of the allowance for loan and lease losses to total loans	3.28%		3.19%
Segment ALLL as a percentage of total ALLL	50.74%		43.61%

[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[2] Amounts represent items for which the Corporation has elected the fair value option.

[3] Future accretable yield related to purchased impaired loans is not included in loans outstanding.

[4] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $2.4 billion and $2.7 billion atSeptember 30, 2011 and December 31, 2010, respectively.