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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | $ 156 | $ 163
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 15,626 | 15,340
Recourse debt |  | 4,065 | 4,630
Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Value added tax |  | 30 | 31
Accounts receivable - noncurrent | [1] | 295 | 217
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 16,006 | 15,890
Recourse debt |  | 4,173 | 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 |  | 14,250 | 13,350
Recourse debt |  | 4,173 | 4,920
Level 3 [Member] | Fair Value [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Accounts receivable - noncurrent | [1] | 295 | 211
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Non-recourse debt |  | 1,756 | 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 $30 million and $31 million as of March 31, 2018 and December 31, 2017, respectively.

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