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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS |  |  |
Non-Recourse Debt |  | $ 15,340 | $ 14,783
Liabilities [Abstract] |  |  |
Recourse debt |  | 4,630 | 4,671
Carrying Amount |  |  |
ASSETS |  |  |
Accounts receivable - noncurrent | [1] | 163 | 232
Non-Recourse Debt |  | 15,340 | 14,783
Liabilities [Abstract] |  |  |
Recourse debt |  | 4,630 | 4,671
Fair Value |  |  |
ASSETS |  |  |
Accounts receivable - noncurrent | [1] | 217 | 342
Non-Recourse Debt |  | 15,890 | 15,185
Liabilities [Abstract] |  |  |
Recourse debt |  | 4,920 | 4,899
Value added tax |  | 31 | 24
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] | 6 | 20
Non-Recourse Debt |  | 13,350 | 14,140
Liabilities [Abstract] |  |  |
Recourse debt |  | 4,920 | 4,899
Fair Value | Level 3 |  |  |
ASSETS |  |  |
Accounts receivable - noncurrent | [1] | 211 | 322
Non-Recourse Debt |  | 2,540 | 1,045
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 $31 million and $24 million as of December 31, 2017 and 2016, respectively.

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