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Fair Value Measurements (Non-Recurring Measurement) (Details) (Fair Value, Inputs, Level 3 [Member], USD $)
In Millions, unless otherwise specified |
9 Months Ended |
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Sep. 30, 2012
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Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | $ 1,579 |
| Weighted Average Discount Rate Used For Level Three Valuation | 10.80% |
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Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Discount Rate Used For Level Three Valuation | 1.60% |
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Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Discount Rate Used For Level Three Valuation | 28.80% |
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Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 4,773 |
| Weighted Average Discount Rate Used For Level Three Valuation | 3.50% |
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Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Discount Rate Used For Level Three Valuation | 1.30% |
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Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Discount Rate Used For Level Three Valuation | 13.30% |
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Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 922 |
| Weighted Average Discount Rate Used For Level Three Valuation | 12.20% |
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Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Discount Rate Used For Level Three Valuation | 0.20% |
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Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Discount Rate Used For Level Three Valuation | 29.70% |
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Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Market Comparables Valuation Technique [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 398 |
| Weighted Average Cost Of Capital Used For Level Three Valuation | 9.30% |
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Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Market Comparables Valuation Technique [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Cost Of Capital Used For Level Three Valuation | 9.20% |
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Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Market Comparables Valuation Technique [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Cost Of Capital Used For Level Three Valuation | 10.90% |
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Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach Valuation Techniques [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 2,382 |
| Weighted Average Capitalization Rate Used For Level Three Valuation | 8.40% |
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Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Capitalization Rate Used For Level Three Valuation | 5.40% |
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Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Capitalization Rate Used For Level Three Valuation | 27.90% |
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Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Business Enterprise Value Valuation Technique [Member] | EBITDA Multiple [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 225 |
| Weighted Average EBITDA Multiple Used For Level Three Valuation | 4.6 |
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Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Business Enterprise Value Valuation Technique [Member] | EBITDA Multiple [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range EBITDA Multiple Used For Level Three Valuation | 4.0 |
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Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Business Enterprise Value Valuation Technique [Member] | EBITDA Multiple [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range EBITDA Multiple Used For Level Three Valuation | 6.9 |
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Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 99 |
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Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member] | Capitalization Rate Unobservable Inputs [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Capitalization Rate Used For Level Three Valuation | 9.20% |
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Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member] | Capitalization Rate Unobservable Inputs [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Capitalization Rate Used For Level Three Valuation | 8.60% |
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Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member] | Capitalization Rate Unobservable Inputs [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Capitalization Rate Used For Level Three Valuation | 12.80% |
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Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | $ 764 |
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Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member] | Capitalization Rate Unobservable Inputs [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Capitalization Rate Used For Level Three Valuation | 8.20% |
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Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member] | Capitalization Rate Unobservable Inputs [Member] | Lower Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Capitalization Rate Used For Level Three Valuation | 4.80% |
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Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member] | Capitalization Rate Unobservable Inputs [Member] | Upper Limit [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Range Capitalization Rate Used For Level Three Valuation | 14.60% |