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Loans and Allowance for Credit Losses (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Additional detail of the allowance for credit losses and related loan balances, by portfolio type          
Balance at beginning of year $ 4,919 $ 5,498 $ 5,014 $ 5,531  
Provision for credit losses 470 572 951 1,327  
Loans charged off 631 850 1,312 1,749  
Less recoveries of loans charged off (111) (103) (221) (197)  
Net loans charged off 520 747 1,091 1,552  
Net change for credit losses to be reimbursed by the FDIC (5) (15) (10) 2  
Balance at end of year 4,864 5,308 4,864 5,308  
Allowance balance at end of year related to:          
Loans individually evaluated for impairment 59   59   80
TDRs collectively evaluated for impairment 799   799   839
Other loans collectively evaluated for impairment 3,900   3,900   4,016
Loans acquired with deteriorated credit quality 106   106   79
Total allowance for credit losses 4,864 5,308 4,864 5,308  
Loan balance at end of year:          
Loans individually evaluated for impairment 973   973   1,244
TDRs collectively evaluated for impairment 4,920   4,920   4,883
Other loans collectively evaluated for impairment 204,911   204,911   197,705
Loans acquired with deteriorated credit quality 5,284   5,284   6,003
Total loans 216,088   216,088   209,835
Commercial loans [Member]
         
Additional detail of the allowance for credit losses and related loan balances, by portfolio type          
Balance at beginning of year 1,029 1,139 1,010 1,104  
Provision for credit losses 79 66 184 240  
Loans charged off 93 125 206 286  
Less recoveries of loans charged off (22) (29) (49) (51)  
Net loans charged off 71 96 157 235  
Balance at end of year 1,037 1,109 1,037 1,109  
Allowance balance at end of year related to:          
Loans individually evaluated for impairment 17   17   16
TDRs collectively evaluated for impairment 36   36   40
Other loans collectively evaluated for impairment 984   984   954
Total allowance for credit losses 1,037 1,109 1,037 1,109  
Loan balance at end of year:          
Loans individually evaluated for impairment 168   168   222
TDRs collectively evaluated for impairment 201   201   277
Other loans collectively evaluated for impairment 61,160   61,160   56,138
Loans acquired with deteriorated credit quality 5   5   11
Total loans 61,534   61,534   56,648
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 1,037 1,275 1,154 1,291  
Provision for credit losses (43) 147 (89) 256  
Loans charged off 76 175 159 315  
Less recoveries of loans charged off (23) (11) (35) (26)  
Net loans charged off 53 164 124 289  
Balance at end of year 941 1,258 941 1,258  
Allowance balance at end of year related to:          
Loans individually evaluated for impairment 42   42   61
TDRs collectively evaluated for impairment 32   32   33
Other loans collectively evaluated for impairment 862   862   1,057
Loans acquired with deteriorated credit quality 5   5   3
Total allowance for credit losses 941 1,258 941 1,258  
Loan balance at end of year:          
Loans individually evaluated for impairment 665   665   812
TDRs collectively evaluated for impairment 385   385   331
Other loans collectively evaluated for impairment 35,376   35,376   34,574
Loans acquired with deteriorated credit quality 131   131   134
Total loans 36,557   36,557   35,851
Residential mortgage loans [Member]
         
Additional detail of the allowance for credit losses and related loan balances, by portfolio type          
Balance at beginning of year 927 819 927 820  
Provision for credit losses 121 141 233 269  
Loans charged off 114 123 230 256  
Less recoveries of loans charged off (5) (4) (9) (8)  
Net loans charged off 109 119 221 248  
Balance at end of year 939 841 939 841  
Allowance balance at end of year related to:          
Loans individually evaluated for impairment         1
TDRs collectively evaluated for impairment 477   477   490
Other loans collectively evaluated for impairment 462   462   436
Total allowance for credit losses 939 841 939 841  
Loan balance at end of year:          
Loans individually evaluated for impairment 6   6   6
TDRs collectively evaluated for impairment 3,542   3,542   3,430
Other loans collectively evaluated for impairment 36,365   36,365   33,642
Loans acquired with deteriorated credit quality 7   7   4
Total loans 39,920   39,920   37,082
Credit card portfolio segment [Member]
         
Additional detail of the allowance for credit losses and related loan balances, by portfolio type          
Balance at beginning of year 1,001 1,276 992 1,395  
Provision for credit losses 165 80 343 208  
Loans charged off 198 241 399 509  
Less recoveries of loans charged off (28) (25) (60) (46)  
Net loans charged off 170 216 339 463  
Balance at end of year 996 1,140 996 1,140  
Allowance balance at end of year related to:          
TDRs collectively evaluated for impairment 196   196   219
Other loans collectively evaluated for impairment 800   800   773
Total allowance for credit losses 996 1,140 996 1,140  
Loan balance at end of year:          
TDRs collectively evaluated for impairment 526   526   584
Other loans collectively evaluated for impairment 16,379   16,379   16,776
Total loans 16,905   16,905   17,360
Other retail portfolio segment [Member]
         
Additional detail of the allowance for credit losses and related loan balances, by portfolio type          
Balance at beginning of year 823 854 831 807  
Provision for credit losses 122 136 246 346  
Loans charged off 149 181 316 376  
Less recoveries of loans charged off (32) (34) (67) (66)  
Net loans charged off 117 147 249 310  
Balance at end of year 828 843 828 843  
Allowance balance at end of year related to:          
TDRs collectively evaluated for impairment 57   57   57
Other loans collectively evaluated for impairment 771   771   774
Total allowance for credit losses 828 843 828 843  
Loan balance at end of year:          
TDRs collectively evaluated for impairment 153   153   148
Other loans collectively evaluated for impairment 47,882   47,882   47,959
Total loans 48,035   48,035   48,107
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 4,817 5,363 4,914 5,417  
Provision for credit losses 444 570 917 1,319  
Loans charged off 630 845 1,310 1,742  
Less recoveries of loans charged off (110) (103) (220) (197)  
Net loans charged off 520 742 1,090 1,545  
Balance at end of year 4,741 5,191 4,741 5,191  
Allowance balance at end of year related to:          
Loans individually evaluated for impairment 59   59   78
TDRs collectively evaluated for impairment 798   798   839
Other loans collectively evaluated for impairment 3,879   3,879   3,994
Loans acquired with deteriorated credit quality 5   5   3
Total allowance for credit losses 4,741 5,191 4,741 5,191  
Loan balance at end of year:          
Loans individually evaluated for impairment 839   839   1,040
TDRs collectively evaluated for impairment 4,807   4,807   4,770
Other loans collectively evaluated for impairment 197,162   197,162   189,089
Loans acquired with deteriorated credit quality 143   143   149
Total loans 202,951   202,951   195,048
Covered portfolio segment [Member]
         
Additional detail of the allowance for credit losses and related loan balances, by portfolio type          
Balance at beginning of year 102 135 100 114  
Provision for credit losses 26 2 34 8  
Loans charged off 1 5 2 7  
Less recoveries of loans charged off (1)   (1)    
Net loans charged off   5 1 7  
Net change for credit losses to be reimbursed by the FDIC (5) (15) (10) 2  
Balance at end of year 123 117 123 117  
Allowance balance at end of year related to:          
Loans individually evaluated for impairment         2
TDRs collectively evaluated for impairment 1   1    
Other loans collectively evaluated for impairment 21   21   22
Loans acquired with deteriorated credit quality 101   101   76
Total allowance for credit losses 123 117 123 117  
Loan balance at end of year:          
Loans individually evaluated for impairment 134   134   204
TDRs collectively evaluated for impairment 113   113   113
Other loans collectively evaluated for impairment 7,749   7,749   8,616
Loans acquired with deteriorated credit quality 5,141   5,141   5,854
Total loans $ 13,137   $ 13,137   $ 14,787