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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Liabilities [Abstract]    
Recourse debt $ 5,015 $ 5,258
Carrying Amount    
ASSETS    
Accounts receivable - noncurrent [1] 270 257
Non-Recourse Debt 15,792 15,600
Liabilities [Abstract]    
Recourse debt 5,015 5,258
Fair Value    
ASSETS    
Accounts receivable - noncurrent [1] 342 246
Non-Recourse Debt 15,939 16,008
Liabilities [Abstract]    
Recourse debt 4,696 5,552
Value added tax 27 36
Fair Value | Level 1    
ASSETS    
Accounts receivable - noncurrent [1] 0 0
Non-Recourse Debt 0 0
Liabilities [Abstract]    
Recourse debt 0 0
Fair Value | Level 2    
ASSETS    
Accounts receivable - noncurrent [1] 20 0
Non-Recourse Debt 13,672 12,538
Liabilities [Abstract]    
Recourse debt 4,696 5,552
Fair Value | Level 3    
ASSETS    
Accounts receivable - noncurrent [1] 322 246
Non-Recourse Debt 2,267 3,470
Liabilities [Abstract]    
Recourse debt $ 0 $ 0
[1] (1) These accounts receivable principally relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and are included in Noncurrent assets — Other in the accompanying Consolidated Balance Sheets. The fair value of these accounts receivable excludes value-added tax of $27 million and $36 million at December 31, 2015 and 2014, respectively.