Fair Value Measurements (Non-Recurring Measurement) (Details) (USD $) In Millions, unless otherwise specified
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3 Months Ended |
Jun. 30, 2012
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Financing receivables and loans held for sale [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Weighted Average Capitalization Rate Used For Level Three Valuation |
8.20% |
Financing receivables and loans held for sale [Member] | Lower Limit [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Range Capitalization Rate Used For Level Three Valuation |
5.40% |
Financing receivables and loans held for sale [Member] | Upper Limit [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Range Capitalization Rate Used For Level Three Valuation |
11.50% |
Cost and equity method investments [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Weighted Average Capitalization Rate Used For Level Three Valuation |
8.30% |
Cost and equity method investments [Member] | Lower Limit [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Range Capitalization Rate Used For Level Three Valuation |
7.00% |
Cost and equity method investments [Member] | Upper Limit [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Range Capitalization Rate Used For Level Three Valuation |
9.30% |
Long Lived Assets, Including Real Estate [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Weighted Average Capitalization Rate Used For Level Three Valuation |
7.40% |
Long Lived Assets, Including Real Estate [Member] | Lower Limit [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Range Capitalization Rate Used For Level Three Valuation |
4.80% |
Long Lived Assets, Including Real Estate [Member] | Upper Limit [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Range Capitalization Rate Used For Level Three Valuation |
11.00% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Weighted Average Discount Rate Used For Level Three Valuation |
10.60% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Range Discount Rate Used For Level Three Valuation |
2.00% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Range Discount Rate Used For Level Three Valuation |
24.90% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Weighted Average Discount Rate Used For Level Three Valuation |
4.20% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Range Discount Rate Used For Level Three Valuation |
1.60% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Range Discount Rate Used For Level Three Valuation |
13.30% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Weighted Average Discount Rate Used For Level Three Valuation |
8.30% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Range Discount Rate Used For Level Three Valuation |
1.30% |
Fair Value, Measurements, Recurring [Member] | 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] |
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Range Discount Rate Used For Level Three Valuation |
30.20% |
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] |
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Weighted Average Cost Of Capital Used For Level Three Valuation |
8.30% |
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] |
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Weighted Average Cost Of Capital Used For Level Three Valuation |
7.60% |
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] |
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Weighted Average Cost Of Capital Used For Level Three Valuation |
8.30% |
Fair Value, Measurements, Recurring [Member] | Other [Member] | Market Comparables Valuation Technique [Member] | EBITDA Multiple [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Weighted Average EBITDA Multiple Used For Level Three Valuation |
9.4 |
Fair Value, Measurements, Recurring [Member] | Other [Member] | Market Comparables 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] |
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Range EBITDA Multiple Used For Level Three Valuation |
9.3 |
Fair Value, Measurements, Recurring [Member] | Other [Member] | Market Comparables 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] |
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Range EBITDA Multiple Used For Level Three Valuation |
11.7 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | 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] |
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Investments, Fair Value Disclosure |
1,547 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | 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] |
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Investments, Fair Value Disclosure |
4,259 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | 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] |
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Investments, Fair Value Disclosure |
912 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other [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] |
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Investments, Fair Value Disclosure |
367 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member] | Market Comparables Valuation Technique [Member] | EBITDA Multiple [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Investments, Fair Value Disclosure |
275 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach Valuation Technique [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Investments, Fair Value Disclosure |
1,828 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [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] |
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Investments, Fair Value Disclosure |
119 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Technique [Member]
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Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items] |
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Investments, Fair Value Disclosure |
441 |