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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
ASSETS    
Non-Recourse Debt $ 15,645 $ 15,340
Liabilities [Abstract]    
Recourse debt 3,655 4,630
Carrying Amount    
ASSETS    
Accounts receivable - noncurrent [1] 100 163
Non-Recourse Debt 15,645 15,340
Liabilities [Abstract]    
Recourse debt 3,655 4,630
Fair Value    
ASSETS    
Accounts receivable - noncurrent [1] 209 217
Non-Recourse Debt 16,225 15,890
Liabilities [Abstract]    
Recourse debt 3,621 4,920
Value added tax 16 31
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] 0 6
Non-Recourse Debt 13,524 13,350
Liabilities [Abstract]    
Recourse debt 3,621 4,920
Fair Value | Level 3    
ASSETS    
Accounts receivable - noncurrent [1] 209 211
Non-Recourse Debt 2,701 2,540
Liabilities [Abstract]    
Recourse debt $ 0 $ 0
[1] These amounts primarily relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and are included in Other noncurrent assets in the accompanying Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $16 million and $31 million as of December 31, 2018 and 2017, respectively.