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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.

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