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Allowance for Credit Losses (Summary of the pre-default balance for modifications that experienced a payment default) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Commercial and Industrial [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months $ 2 $ 13
Commercial Real Estate - Other [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months 1 30
Commercial Real Estate - Residential ADC [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months 8 41
Direct Retail Lending [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months 2 9
Retail Revolving Credit [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months 3 5
Retail Residential Mortgage [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months 17 13
Retail Sales Finance [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months 0 1
Retail Other Lending Subsidiaries [Member]
   
Financing Receivable, Modifications [Line Items]    
Modifications that defaulted during the period that had been classified as a restructuring during the previous 12 months $ 2 $ 1