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Fair Value (Fair Value Measurements - Nonrecurring Fair Value Inputs) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
 
Fair value inputs, Quantitative Information [Line Items]  
Commercial automobile finance receivables $ 108
Commercial Finance Receivables And Loans, Automotive [Member] | Fair Value of Collateral [Member] | Minimum [Member]
 
Fair value inputs, Quantitative Information [Line Items]  
Fair Value Inputs, Adjusted Appraisal Value 65.00%
Commercial Finance Receivables And Loans, Automotive [Member] | Fair Value of Collateral [Member] | Maximum [Member]
 
Fair value inputs, Quantitative Information [Line Items]  
Fair Value Inputs, Adjusted Appraisal Value 95.00%