|
Variable Interest Entities and Unconsolidated Investments (Unconsolidated VIEs) (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Schedule of Equity Method Investments [Line Items] | ||
| Equity Method Investments | $ 95 | $ 81 |
|
Greenfield [Member]
|
||
| Schedule of Equity Method Investments [Line Items] | ||
| Equity Method Investments | 81 | 69 |
| Equity Method Investment, Ownership Percentage | 50.00% | |
|
Whitby [Member]
|
||
| Schedule of Equity Method Investments [Line Items] | ||
| Equity Method Investments | $ 14 | $ 12 |
| Equity Method Investment, Ownership Percentage | 50.00% |