|
Debt (Details 5) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2012
|
Dec. 31, 2011
|
Mar. 31, 2012
One Month [Member]
|
Mar. 31, 2012
Two Months [Member]
|
Mar. 31, 2012
Three Months [Member]
|
Mar. 31, 2012
Six Months [Member]
|
Mar. 31, 2012
Nine Months [Member]
|
Mar. 31, 2012
Twelve Months [Member]
|
Mar. 31, 2012
Minimum [Member]
|
Mar. 31, 2012
Maximum [Member]
|
Mar. 31, 2012
Corporate Revolving Facility [Member]
|
Dec. 31, 2011
Corporate Revolving Facility [Member]
|
Mar. 31, 2012
CDH [Member]
|
Dec. 31, 2011
CDH [Member]
|
Mar. 31, 2012
Various Project Financing Facilities [Member]
|
Dec. 31, 2011
Various Project Financing Facilities [Member]
|
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| Line of Credit Facility [Line Items] | ||||||||||||||||||||
| Line of Credit Facility, Fair Value of Amount Outstanding | $ 707 | $ 763 | $ 351 | $ 440 | $ 226 | [1] | $ 193 | [1] | $ 130 | $ 130 | ||||||||||
| Corporate Revolving Facility Interest Details [Abstract] | ||||||||||||||||||||
| Applicable margin range percentage above base rate | 2.00% | 2.25% | ||||||||||||||||||
| Interest periods for LIBOR rate borrowings | 1 | 2 | 3 | 6 | 9 | 12 | ||||||||||||||
| Applicable Margin Range Percentage Above British Bankers' Association Interest Settlement Rates | 3.00% | 3.25% | ||||||||||||||||||
| Unused commitment fee range percentage | 0.50% | 0.75% | ||||||||||||||||||
|
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