v2.4.0.6

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

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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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