v2.4.0.6
Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) $ 29,729 $ 30,968 $ 58,797
Loans 799,966 799,574  
Total Consumer [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) 26,227 26,991 40,093
Loans 438,252 438,376  
Real estate 1-4 family first mortgage [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) 26,086 26,839 39,214
Loans 252,307 249,900  
Real estate 1-4 family junior lien mortgage [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) 141 152 728
Loans 72,543 75,465  
Credit Card [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) 0 0  
Loans 24,120 24,640  
Automobile [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) 0 0 151
Loans 47,259 45,998  
Other revolving credit and installment [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Purchased Credit Impaired Loans (carrying value) 0 0  
Loans 42,023 42,373  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current-29 DPD 353,966 351,621  
30-59 DPD 4,449 5,049  
60-89 DPD 1,948 2,282  
90-119 DPD and still accruing 1,130 1,370  
120-179 DPD and still accruing 1,482 1,719  
180+ DPD and still accruing 6,779 7,179  
Government insured/guaranteed loans 42,271 42,165  
Loans, excluding Purchased Credit Impaired Loans 412,025 411,385  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current-29 DPD 183,532 179,870  
30-59 DPD 3,071 3,295  
60-89 DPD 1,340 1,528  
90-119 DPD and still accruing 700 853  
120-179 DPD and still accruing 960 1,141  
180+ DPD and still accruing 6,251 6,655  
Government insured/guaranteed loans 30,367 29,719  
Loans, excluding Purchased Credit Impaired Loans 226,221 223,061  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current-29 DPD 70,561 73,256  
30-59 DPD 521 577  
60-89 DPD 284 339  
90-119 DPD and still accruing 215 265  
120-179 DPD and still accruing 300 358  
180+ DPD and still accruing 521 518  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans 72,402 75,313  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current-29 DPD 23,527 23,976  
30-59 DPD 163 211  
60-89 DPD 124 143  
90-119 DPD and still accruing 111 122  
120-179 DPD and still accruing 193 187  
180+ DPD and still accruing 2 1  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans 24,120 24,640  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current-29 DPD 46,580 44,973  
30-59 DPD 532 798  
60-89 DPD 103 164  
90-119 DPD and still accruing 39 57  
120-179 DPD and still accruing 5 5  
180+ DPD and still accruing 0 1  
Government insured/guaranteed loans 0 0  
Loans, excluding Purchased Credit Impaired Loans 47,259 45,998  
Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Current-29 DPD 29,766 29,546  
30-59 DPD 162 168  
60-89 DPD 97 108  
90-119 DPD and still accruing 65 73  
120-179 DPD and still accruing 24 28  
180+ DPD and still accruing 5 4  
Government insured/guaranteed loans 11,904 12,446  
Loans, excluding Purchased Credit Impaired Loans $ 42,023 $ 42,373