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Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of strategic business units | segment |  |  |  |  |  | 6 |  |
Number of reportable segments | segment |  |  |  |  |  | 6 |  |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  | $ (7) |  | $ (1) |  | $ (14) | $ (15) |
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES |  | (22) |  | 396 |  | 151 | 743 |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 36,974 |  |  |  | 36,974 |  | $ 36,470
External [Member] |  |  |  |  |  |  |  |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |  |  |  |  |
Unrealized derivative gains (losses) |  | (30) |  | 2 |  | 4 | 17 |
Unrealized foreign currency gains (losses) |  | (17) |  | 4 |  | (9) | (43) |
Disposition/acquisition gains |  | (17) |  | 4 |  | 2 | 9 |
Impairment losses |  | (235) |  | (30) |  | (285) | (36) |
Loss on extinguishment of debt |  | (6) |  | (112) |  | (6) | (138) |
Pretax contribution |  | (145) |  | 128 |  | 51 | 331 |
Add: income from continuing operations before taxes, attributable to noncontrolling interests |  | 130 |  | 269 |  | 114 | 427 |
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES |  | (22) |  | 396 |  | 151 | 743 |
Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 3,229 |  | 3,656 |  | 6,500 | 7,414 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | [1] | 160 |  | 260 |  | 345 | 522 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | (6) |  | (11) |  | (11) | (17) |
UNITED STATES |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 9,705 |  |  |  | 9,705 |  | 9,800
UNITED STATES | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 811 |  | 831 |  | 1,666 | 1,828 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | 58 | [1] | 56 | [1] | 143 | 162 |
Andes - Generation [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 8,755 |  |  |  | 8,755 |  | 8,594
Andes - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 575 |  | 630 |  | 1,197 | 1,242 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | 84 | [1] | 81 | [1] | 145 | 172 |
BRAZIL |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 6,085 |  |  |  | 6,085 |  | 5,209
BRAZIL | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 895 |  | 1,113 |  | 1,734 | 2,217 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | 7 | [1] | 51 | [1] | 12 | 82 |
MCAC - Generation [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 5,146 |  |  |  | 5,146 |  | 4,820
MCAC - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 530 |  | 601 |  | 1,049 | 1,199 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | 75 | [1] | 106 | [1] | 123 | 156 |
Europe [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 2,807 |  |  |  | 2,807 |  | 3,101
Europe [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 222 |  | 299 |  | 468 | 629 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | 34 | [1] | 41 | [1] | 103 | 126 |
Asia [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 3,126 |  |  |  | 3,126 |  | 3,099
Asia [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 201 |  | 187 |  | 395 | 306 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | 26 | [1] | 30 | [1] | 48 | 42 |
Corporate Other And Other Eliminations [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | 302 |  |  |  | 302 |  | 541
Corporate Other And Other Eliminations [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total Revenue |  | 1 |  | 6 |  | 2 | 10 |
Adjusted PTC |  |  |  |  |  |  |  |
Adjusted Pretax Contribution |  | (124) | [1] | $ (105) | [1] | (229) | $ (218) |
Discontinued Operations [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Total Assets |  | $ 1,048 |  |  |  | $ 1,048 |  | $ 1,306
[1] | Total AssetsJune 30, 2016 December 31, 2015US SBU$9,705 $9,800Andes SBU8,755 8,594Brazil SBU6,085 5,209MCAC SBU5,146 4,820Europe SBU2,807 3,101Asia SBU3,126 3,099Assets of discontinued operations and held-for-sale businesses1,048 1,306Corporate and Other302 541Total Assets$36,974 $36,470

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