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Debt (Letter of Credit) (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2014
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Dec. 31, 2013
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| Line of Credit Facility [Line Items] | ||||||||
| Letters of Credit Outstanding, Amount | $ 675 | $ 630 | ||||||
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Corporate Revolving Facility [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Letters of Credit Outstanding, Amount | 235 | [1] | 242 | [1] | ||||
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CDH [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Letters of Credit Outstanding, Amount | 269 | [2] | 218 | [2] | ||||
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Various Project Financing Facilities [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Letters of Credit Outstanding, Amount | $ 171 | $ 170 | ||||||
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