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Fair Value Measurements (Non-Recurring Measurement) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
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Jun. 30, 2012
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Financing receivables and loans held for sale [Member] | Income Approach Valuation Technique [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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Financing receivables and loans held for sale [Member] | Income Approach Valuation Technique [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 | 5.40% |
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Financing receivables and loans held for sale [Member] | Income Approach Valuation Technique [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 | 11.50% |
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Cost and equity method investments [Member] | Income Approach Valuation Technique [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 | 8.30% |
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Cost and equity method investments [Member] | Income Approach Valuation Technique [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 | 7.00% |
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Cost and equity method investments [Member] | Income Approach Valuation Technique [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 | 9.30% |
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Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Technique [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 | 7.40% |
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Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Technique [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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Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Technique [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 | 11.00% |
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Domestic Corporate Debt Securities [Member] | Income Approach Valuation Technique [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Discount Rate Used For Level Three Valuation | 10.60% |
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Domestic Corporate Debt Securities [Member] | Income Approach Valuation Technique [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 | 2.00% |
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Domestic Corporate Debt Securities [Member] | Income Approach Valuation Technique [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 | 24.90% |
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Asset-backed Securities [Member] | Income Approach Valuation Technique [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Discount Rate Used For Level Three Valuation | 4.20% |
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Asset-backed Securities [Member] | Income Approach Valuation Technique [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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Asset-backed Securities [Member] | Income Approach Valuation Technique [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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Foreign Corporate Debt Securities [Member] | Income Approach Valuation Technique [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Weighted Average Discount Rate Used For Level Three Valuation | 8.30% |
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Foreign Corporate Debt Securities [Member] | Income Approach Valuation Technique [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% |
|
Foreign Corporate Debt Securities [Member] | Income Approach Valuation Technique [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 | 30.20% |
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Fair Value, Measurements, Recurring [Member] | Other [Member] | Market Comparables Valuation Technique [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 | 8.30% |
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Fair Value, Measurements, Recurring [Member] | Other [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 | 7.60% |
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Fair Value, Measurements, Recurring [Member] | Other [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 | 8.30% |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Cost and equity method investments [Member] | Income Approach Valuation Technique [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 1,547 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Cost and equity method investments [Member] | Income Approach Valuation Technique [Member]
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|
| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 4,259 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Cost and equity method investments [Member] | Income Approach Valuation Technique [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 912 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member] | Cost and equity method investments [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 | 367 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach Valuation Technique [Member] | Capitalization Rate Unobservable Inputs [Member]
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|
| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 1,828 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Technique [Member] | Capitalization Rate Unobservable Inputs [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 119 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Technique [Member] | Capitalization Rate Unobservable Inputs [Member]
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| Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] | |
| Investments, Fair Value Disclosure | 441 |