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Assets And Liabilities Measured At Fair Value Realized Unrealized Gain Loss (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Realized and unrealized gains (losses) on financial instruments, net | $ 18 | $ 15 | $ (48) | $ (49) |
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Fair Value Option Securities
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Realized and unrealized gains (losses) on financial instruments, net | 1 | 31 | 81 | 367 |
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Exchangeable Senior Debentures
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Realized and unrealized gains (losses) on financial instruments, net | 17 | (15) | (129) | (431) |
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Other Financial Instruments
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Realized and unrealized gains (losses) on financial instruments, net | $ (1) | $ 15 | ||