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Segments (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of strategic business units | segment |  |  | 5 |  |
Number of reportable segments | segment |  |  | 5 |  |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | $ 245 | $ 272 | $ 678 | $ 617 |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |  |
Unrealized derivative losses (gains) | (8) | 5 | (7) | 1 |
Unrealized foreign currency transaction losses (gains) | (21) | 3 | (54) | 12 |
Disposition/acquisition losses (gains) | 1 | (3) | 107 | (5) |
Impairment losses | 2 | 24 | 264 | 309 |
Extinguishment of debt losses (gains) | 48 | 20 | 43 | 26 |
Pretax contribution | 223 | 223 | 325 | 274 |
Net equity in earnings of affiliates | 24 | 11 | 33 | 25 |
Less: Income (loss) from continuing operations before taxes, attributable to noncontrolling interests | (148) | (82) | (454) | (196) |
Income (loss) from continuing operations before taxes and equity in earnings of affiliates | 347 | 294 | 746 | 445 |
Assets |  |  |  |  |
Total Assets | 38,834 |  | 38,834 |  | $ 36,119
Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 3,632 | 3,542 | 10,594 | 10,042 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | 245 | 272 | 678 | 617 |
Intersegment Eliminations [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | (13) | (7) | (20) | (18) |
UNITED STATES |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 10,104 |  | 10,104 |  | 9,333
UNITED STATES | Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 852 | 916 | 2,445 | 2,582 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | 129 | 114 | 240 | 257 |
Andes - Generation [Member] |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 9,339 |  | 9,339 |  | 8,971
Andes - Generation [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 689 | 667 | 1,979 | 1,864 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | 62 | 134 | 232 | 279 |
BRAZIL |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 7,416 |  | 7,416 |  | 6,448
BRAZIL | Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 1,085 | 1,027 | 3,106 | 2,761 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | 12 | 6 | 64 | 18 |
MCAC - Generation [Member] |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 5,640 |  | 5,640 |  | 5,162
MCAC - Generation [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 630 | 547 | 1,851 | 1,596 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | 98 | 74 | 256 | 197 |
Eurasia - Generation [Member] |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 5,938 |  | 5,938 |  | 5,777
Eurasia - Generation [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 380 | 386 | 1,204 | 1,249 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | 61 | 46 | 218 | 197 |
Corporate Other And Other Eliminations [Member] |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 321 |  | 321 |  | 428
Corporate Other And Other Eliminations [Member] | Operating Segments [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 9 | 6 | 29 | 8 |
Adjusted PTC |  |  |  |  |
Adjusted Pretax Contribution | (117) | $ (102) | (332) | $ (331) |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |
Assets |  |  |  |  |
Total Assets | $ 76 |  | $ 76 |  | $ 0

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