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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Carrying Amount [Member]    
Assets, Fair Value Disclosure [Abstract]    
Accounts receivable - noncurrent [1] $ 294 $ 301
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 15,591 15,600
Recourse debt 5,107 5,258
Fair Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Value added tax 48 36
Accounts receivable - noncurrent [1] 284 290
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 15,660 16,008
Recourse debt 4,841 5,552
Level 1 [Member] | Fair Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Accounts receivable - noncurrent [1] 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 0 0
Recourse debt 0 0
Level 2 [Member] | Fair Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Accounts receivable - noncurrent [1] 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 11,387 12,538
Recourse debt 4,841 5,552
Level 3 [Member] | Fair Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Accounts receivable - noncurrent [1] 284 290
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 4,273 3,470
Recourse debt $ 0 $ 0
[1] These amounts principally relate to amounts due from CAMMESA, and are included in Noncurrent assets—Other in the accompanying Condensed Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $48 million and $36 million at September 30, 2015 and December 31, 2014, respectively.