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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
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]          
Beginning Balance     $ 3,609 [1] $ 4,036  
Charge-offs     (564) (925)  
Recoveries     233 261  
Net charge-offs     (331) (664)  
Provision For Credit Losses 72 157 166 393  
Net change in allowance for unfunded loan commitments and letters of credit     10 8  
Other     (1) (1)  
Ending Balance 3,453 [1] 3,772 3,453 [1] 3,772  
TDRs individually evaluated for impairment - associated allowance 436 507 436 507 470
Other loans individually evaluated for impairment - associated allowance 118 203 118 203  
Loans collectively evaluated for impairment - associated allowance 2,013 1,945 2,013 1,945  
Purchased impaired loans - associated allowance 886 1,117 886 1,117  
TDRs individually evaluated for impairment 2,666 2,842 2,666 2,842  
Other loans individually evaluated for impairment 526 840 526 840  
Loans collectively evaluated for impairment 191,351 178,504 191,351 178,504  
Fair value option loans 884 811 884 811  
Purchased impaired loans 5,557 6,778 5,557 6,778 6,106
Total loans 200,984 [1],[2] 189,775 200,984 [1],[2] 189,775 195,613 [1],[2]
Portfolio segment ALLL as a percentage of total ALLL 100.00% 100.00% 100.00% 100.00%  
Ratio of the allowance for loan and lease losses to total loans 1.72% 1.99% 1.72% 1.99%  
Impact of alignment with interagency guidance - Additional chargeoffs taken       134  
Evaluated for impairment based upon collateral values
         
Financing Receivable Allowance For Credit Losses [Line Items]          
Loans collectively evaluated for impairment 232 291 232 291  
Total commercial lending [Member]
         
Financing Receivable Allowance For Credit Losses [Line Items]          
Beginning Balance     1,547 1,774  
Charge-offs     (209) (336)  
Recoveries     149 185  
Net charge-offs     (60) (151)  
Provision For Credit Losses     108 28  
Net change in allowance for unfunded loan commitments and letters of credit     10 8  
Other     (1) (1)  
Ending Balance 1,604 1,658 1,604 1,658  
TDRs individually evaluated for impairment - associated allowance 29 25 29 25  
Other loans individually evaluated for impairment - associated allowance 118 203 118 203  
Loans collectively evaluated for impairment - associated allowance 1,349 1,247 1,349 1,247  
Purchased impaired loans - associated allowance 108 183 108 183  
TDRs individually evaluated for impairment 545 599 545 599  
Other loans individually evaluated for impairment 526 840 526 840  
Loans collectively evaluated for impairment 122,533 110,863 122,533 110,863  
Purchased impaired loans   968   968  
Total loans 124,083 113,270 124,083 113,270 117,145
Portfolio segment ALLL as a percentage of total ALLL 46.00% 44.00% 46.00% 44.00%  
Ratio of the allowance for loan and lease losses to total loans 1.29% 1.46% 1.29% 1.46%  
Total consumer lending [Member]
         
Financing Receivable Allowance For Credit Losses [Line Items]          
Beginning Balance     2,062 2,262  
Charge-offs     (355) (589)  
Recoveries     84 76  
Net charge-offs     (271) (513)  
Provision For Credit Losses     58 365  
Ending Balance 1,849 2,114 1,849 2,114  
TDRs individually evaluated for impairment - associated allowance 407 482 407 482  
Loans collectively evaluated for impairment - associated allowance 664 698 664 698  
Purchased impaired loans - associated allowance 778 934 778 934  
TDRs individually evaluated for impairment 2,121 2,243 2,121 2,243  
Loans collectively evaluated for impairment 68,818 67,641 68,818 67,641  
Fair value option loans 884 811 884 811  
Purchased impaired loans   5,810   5,810  
Total loans $ 76,901 $ 76,505 $ 76,901 $ 76,505 $ 78,468
Portfolio segment ALLL as a percentage of total ALLL 54.00% 56.00% 54.00% 56.00%  
Ratio of the allowance for loan and lease losses to total loans 2.40% 2.76% 2.40% 2.76%  
[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).
[2] Amounts represent items for which we have elected the fair value option.