Fair Value (Fair Value Measurements - Nonrecurring Fair Value Inputs) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2012
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Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
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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]
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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]
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Fair value inputs, Quantitative Information [Line Items] | |
Fair Value Inputs, Adjusted Appraisal Value | 95.00% |