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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 | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2014
|
Jun. 30, 2013
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Jun. 30, 2014
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Jun. 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 | $ (41) | $ 9 | $ (66) | $ (64) |
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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 | 90 | 112 | 80 | 336 |
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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 | (131) | (106) | (146) | (416) |
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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 | $ 0 | $ 3 | $ 0 | $ 16 |