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Segments (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) segment | Mar. 31, 2015 USD ($) | 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 FROM OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES |  | $ 160 | $ 335 |
Assets |  |  |  |
Total Assets |  | 36,900 |  | $ 36,470
External [Member] |  |  |  |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |
Unrealized derivative gains (losses) |  | 34 | 15 |
Unrealized foreign currency gains (losses) |  | 8 | (47) |
Disposition/acquisition gains |  | 19 | 5 |
Impairment losses |  | (50) | (6) |
Loss on extinguishment of debt |  | (1) | (27) |
Pretax contribution |  | 182 | 192 |
Add: income from continuing operations before taxes, attributable to noncontrolling interests |  | (16) | 158 |
Less: Net equity in earnings of affiliates |  | 6 | 15 |
Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 3,471 | 3,984 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | 172 | 252 |
Intersegment Eliminations [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | (6) | (6) |
UNITED STATES |  |  |  |
Assets |  |  |  |
Total Assets |  | 9,890 |  | 9,800
UNITED STATES | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 855 | 997 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | 85 | 106 |
Andes - Generation [Member] |  |  |  |
Assets |  |  |  |
Total Assets |  | 8,484 |  | 8,594
Andes - Generation [Member] | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 622 | 612 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | 61 | 91 |
BRAZIL |  |  |  |
Assets |  |  |  |
Total Assets |  | 6,988 |  | 6,419
BRAZIL | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 1,040 | 1,330 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | (9) | 21 |
MCAC - Generation [Member] |  |  |  |
Assets |  |  |  |
Total Assets |  | 4,921 |  | 4,820
MCAC - Generation [Member] | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 519 | 598 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | 48 | 50 |
Europe [Member] |  |  |  |
Assets |  |  |  |
Total Assets |  | 3,140 |  | 3,101
Europe [Member] | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 246 | 330 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | 69 | 85 |
Asia [Member] |  |  |  |
Assets |  |  |  |
Total Assets |  | 3,135 |  | 3,099
Asia [Member] | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 194 | 119 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | 22 | 12 |
Corporate Other And Other Eliminations [Member] |  |  |  |
Assets |  |  |  |
Total Assets |  | 342 |  | 541
Corporate Other And Other Eliminations [Member] | Operating Segments [Member] |  |  |  |
Revenue |  |  |  |
Total Revenue |  | 1 | 4 |
Adjusted PTC |  |  |  |
Adjusted Pretax Contribution | [1] | (104) | $ (113) |
Discontinued Operations [Member] |  |  |  |
Assets |  |  |  |
Total Assets |  | $ 0 |  | $ 96
[1] | Total Assets March 31, 2016 December 31, 2015US SBU $9,890 $9,800Andes SBU 8,484 8,594Brazil SBU 6,988 6,419MCAC SBU 4,921 4,820Europe SBU 3,140 3,101Asia SBU 3,135 3,099Assets of held-for-sale businesses — 96Corporate and Other 342 541Total Assets $36,900 $36,470

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