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Investments (Fair Value Method Investments) (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Fair value equity securities held | $ 4,540,000,000 | $ 4,143,000,000 |
| Obligations under prepaid forward sale agreements | 1,125,000,000 | 1,248,000,000 |
| Derivative component of prepaid forward sale agreements | 2,888,000,000 | 2,302,000,000 |
| Total liabilities associated with prepaid forward sale agreements | 4,013,000,000 | 3,550,000,000 |
| Prepaid forward sale obligations fair value | $ 4,100,000,000 |
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- Definition
This element represents the fair value as of the balance sheet date of embedded derivative liabilities as a component of prepaid forward sale agreements valued on a recurring basis. No definition available.
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- Definition
Fair value method equity securities held as collateral related to our obligations under prepaid forward sale agreements. No definition available.
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| X | ||||||||||
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- Definition
The carrying value of the liabilities related to prepaid forward sale agreements. No definition available.
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| X | ||||||||||
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- Definition
The carrying value of obligations related to prepaid forward sale agreements. No definition available.
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| X | ||||||||||
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- Definition
The estimated fair value of our prepaid forward sale obligations. No definition available.
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