v2.4.0.8

Debt (Letter of Credit) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | $ 614 |  | $ 626 |
Corporate Revolving Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | 240 | [1] | 243 | [1]
CDH [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | 243 |  | 253 |
Various Project Financing Facilities [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | $ 131 |  | $ 130 |
[1] | The Corporate Revolving Facility represents our primary revolving facility.

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration