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Loans and ACL (Breakdown of Recorded Investment in Loans Based on the Method for Determining Allowance) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Individually Evaluated for Impairment $ 2,660 $ 2,747
Collectively Evaluated for Impairment 113,134 111,856
Commercial and Industrial [Member]
   
Individually Evaluated for Impairment 545 631
Collectively Evaluated for Impairment 38,156 37,664
Commercial Real Estate - Other [Member]
   
Individually Evaluated for Impairment 278 312
Collectively Evaluated for Impairment 11,162 11,149
Commercial Real Estate - Residential ADC [Member]
   
Individually Evaluated for Impairment 94 155
Collectively Evaluated for Impairment 964 1,106
Commercial Other Lending Subsidiaries [Member]
   
Individually Evaluated for Impairment 3 3
Collectively Evaluated for Impairment 4,388 4,135
Direct Retail Lending [Member]
   
Individually Evaluated for Impairment 225 235
Collectively Evaluated for Impairment 15,844 15,582
Retail Revolving Credit [Member]
   
Individually Evaluated for Impairment 53 56
Collectively Evaluated for Impairment 2,272 2,274
Retail Residential Mortgage [Member]
   
Individually Evaluated for Impairment 1,239 1,187
Collectively Evaluated for Impairment 22,556 23,085
Retail Sales Finance [Member]
   
Individually Evaluated for Impairment 21 22
Collectively Evaluated for Impairment 8,800 7,714
Retail Other Lending Subsidiaries [Member]
   
Individually Evaluated for Impairment 202 146
Collectively Evaluated for Impairment 6,243 5,853
Covered [Member]
   
Collectively Evaluated for Impairment $ 2,749 $ 3,294