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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Liabilities [Abstract] |  |  |
Recourse debt |  | $ 5,015 | $ 5,258
Carrying Amount |  |  |
ASSETS |  |  |
Accounts receivable - noncurrent | [1] | 270 | 257
Non-Recourse Debt |  | 15,792 | 15,600
Liabilities [Abstract] |  |  |
Recourse debt |  | 5,015 | 5,258
Fair Value |  |  |
ASSETS |  |  |
Accounts receivable - noncurrent | [1] | 342 | 246
Non-Recourse Debt |  | 15,939 | 16,008
Liabilities [Abstract] |  |  |
Recourse debt |  | 4,696 | 5,552
Value added tax |  | 27 | 36
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] | 20 | 0
Non-Recourse Debt |  | 13,672 | 12,538
Liabilities [Abstract] |  |  |
Recourse debt |  | 4,696 | 5,552
Fair Value | Level 3 |  |  |
ASSETS |  |  |
Accounts receivable - noncurrent | [1] | 322 | 246
Non-Recourse Debt |  | 2,267 | 3,470
Liabilities [Abstract] |  |  |
Recourse debt |  | $ 0 | $ 0
[1] | (1) These accounts receivable principally relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and are included in Noncurrent assets — Other in the accompanying Consolidated Balance Sheets. The fair value of these accounts receivable excludes value-added tax of $27 million and $36 million at December 31, 2015 and 2014, respectively.

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