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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | $ 200 | $ 264
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 17,079 | 15,792
Recourse debt |  | 4,958 | 4,671
Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Value added tax |  | 38 | 24
Accounts receivable - noncurrent | [1] | 262 | 350
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 17,706 | 16,188
Recourse debt |  | 5,266 | 4,899
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] | 6 | 20
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 15,479 | 15,120
Recourse debt |  | 5,266 | 4,899
Level 3 [Member] | Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | 256 | 330
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 2,227 | 1,068
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 $38 million and $24 million as of September 30, 2017 and December 31, 2016, respectively.

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