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Debt (Corporate Revolving Facility and other Letters of Credit Facilities) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|
| Line of Credit Facility [Line Items] | ||
| Line of Credit Facility, Fair Value of Amount Outstanding | $ 626 | $ 763 |
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Corporate Revolving Facility [Member]
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| Line of Credit Facility [Line Items] | ||
| Line of Credit Facility, Fair Value of Amount Outstanding | 243 | 440 |
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CDH [Member]
|
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| Line of Credit Facility [Line Items] | ||
| Line of Credit Facility, Fair Value of Amount Outstanding | 253 | 193 |
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Various Project Financing Facilities [Member]
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| Line of Credit Facility [Line Items] | ||
| Line of Credit Facility, Fair Value of Amount Outstanding | $ 130 | $ 130 |