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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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Beginning Balance $ 4,347 [1] $ 4,887 $ 5,072
Charge-offs (1,870) (2,264) (3,492)
Recoveries 581 625 556
Net charge-offs (1,289) (1,639) (2,936)
Provision for credit losses 987 1,152 2,502
Net change in allowance for unfunded loan commitments and letters of credit (10) (52) 108
Other 1 (1)  
Ending Balance 4,036 [1] 4,347 [1] 4,887
TDRs individually evaluated for impairment - associated allowance 587 580 509
Other loans individually evaluated for impairment - associated allowance 253 520 835
Loans collectively evaluated for impairment - associated allowance 2,099 2,249 2,646
Purchased impaired loans - associated allowance 1,097 998 897
TDRs individually evaluated for impairment 2,859 2,203 1,622
Other loans individually evaluated for impairment 1,057 1,890 2,888
Loans collectively evaluated for impairment 174,534 148,254 138,305
Purchased impaired loans 7,406 6,667 7,780
Total loans 185,856 [1],[2] 159,014 [1],[2] 150,595
Portfolio segment ALLL as a percentage of total ALLL 100.00% 100.00% 100.00%
Ratio of the allowance for loan and lease losses to total loans 2.17% 2.73% 3.25%
Adoption of ASU 2009-17, Consolidations     141
Total commercial lending [Member]
     
Beginning Balance 1,995 2,567 3,345
Charge-offs (804) (1,199) (2,017)
Recoveries 445 487 427
Net charge-offs (359) (712) (1,590)
Provision for credit losses 138 177 704
Net change in allowance for unfunded loan commitments and letters of credit (1) (36) 108
Other 1 (1)  
Ending Balance 1,774 1,995 2,567
TDRs individually evaluated for impairment - associated allowance 40 39 24
Other loans individually evaluated for impairment - associated allowance 253 520 835
Loans collectively evaluated for impairment - associated allowance 1,242 1,207 1,419
Purchased impaired loans - associated allowance 239 229 289
TDRs individually evaluated for impairment 541 405 200
Other loans individually evaluated for impairment 1,057 1,890 2,888
Loans collectively evaluated for impairment 106,095 85,167 75,014
Purchased impaired loans 1,249 852 1,402
Total loans 108,942 88,314 79,504
Portfolio segment ALLL as a percentage of total ALLL 44.00% 46.00% 53.00%
Ratio of the allowance for loan and lease losses to total loans 1.63% 2.26% 3.23%
Total consumer lending [Member]
     
Beginning Balance 2,352 2,320 1,727
Charge-offs (1,066) (1,065) (1,475)
Recoveries 136 138 129
Net charge-offs (930) (927) (1,346)
Provision for credit losses 849 975 1,798
Net change in allowance for unfunded loan commitments and letters of credit (9) (16)  
Ending Balance 2,262 2,352 2,320
TDRs individually evaluated for impairment - associated allowance 547 541 485
Loans collectively evaluated for impairment - associated allowance 857 1,042 1,227
Purchased impaired loans - associated allowance 858 769 608
TDRs individually evaluated for impairment 2,318 1,798 1,422
Loans collectively evaluated for impairment 68,439 63,087 63,291
Purchased impaired loans 6,157 5,815 6,378
Total loans 76,914 70,700 71,091
Portfolio segment ALLL as a percentage of total ALLL 56.00% 54.00% 47.00%
Ratio of the allowance for loan and lease losses to total loans 2.94% 3.33% 3.26%
Adoption of ASU 2009-17, Consolidations     $ 141
[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.