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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Carrying Amount [Member]    
Assets, Fair Value Disclosure [Abstract]    
Accounts receivable - noncurrent [1] $ 105 $ 163
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 15,581 15,340
Recourse debt 3,820 4,630
Fair Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Value added tax 14 31
Accounts receivable - noncurrent [1] 224 217
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 15,429 15,890
Recourse debt 3,901 4,920
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 6
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 12,699 13,350
Recourse debt 3,901 4,920
Level 3 [Member] | Fair Value [Member]    
Assets, Fair Value Disclosure [Abstract]    
Accounts receivable - noncurrent [1] 224 211
Liabilities, Fair Value Disclosure [Abstract]    
Non-recourse debt 2,730 2,540
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 Condensed Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $14 million and $31 million as of September 30, 2018 and December 31, 2017, respectivel