|
Assets And Liabilities Measured At Fair Value Realized Unrealized Gain Loss (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Realized and unrealized gains (losses) on financial instruments, net (note 7) | $ (57) | $ (22) | $ (351) |
| Fair Value Option Securities | |||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Realized and unrealized gains (losses) on financial instruments, net (note 7) | 173 | 514 | 470 |
| Exchangeable Senior Debentures | |||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Realized and unrealized gains (losses) on financial instruments, net (note 7) | (230) | (553) | (602) |
| Other Financial Instruments | |||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Realized and unrealized gains (losses) on financial instruments, net (note 7) | $ 17 | $ (219) | |