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Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 segment | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Number of strategic business units |  |  |  |  | 6 |  |  |  |
Number of reportable segments |  |  |  |  | 6 |  |  |  |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |  |  |  |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES | $ 418 |  | $ 407 |  | $ 536 |  | $ 717 |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 39,433 |  |  |  | 39,433 |  |  |  | 40,411
External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 4,311 |  | 3,945 |  | 8,573 |  | 8,095 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 340 | [1] | 289 | [1] | 583 | [1] | 559 | [1] |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |  |  |  |  |  |
Unrealized derivative gains (losses) | 22 |  | 53 |  | 32 |  | 39 |  |
Unrealized foreign currency gains (losses) | (7) |  | (23) |  | (33) |  | (49) |  |
Disposition/acquisition gains (losses) | (2) |  | 23 |  | (1) |  | 26 |  |
Impairment losses | (99) |  | 0 |  | (265) |  | (48) |  |
Loss on extinguishment of debt | (13) |  | (164) |  | (147) |  | (207) |  |
Pretax contribution | 241 |  | 178 |  | 169 |  | 320 |  |
Add: income from continuing operations before taxes, attributable to noncontrolling interests | 197 |  | 231 |  | 412 |  | 403 |  |
Less: Net equity in earnings of affiliates | 20 |  | 2 |  | 45 |  | 6 |  |
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES | 418 |  | 407 |  | 536 |  | 717 |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 4,315 |  | 3,947 |  | 8,580 |  | 8,098 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 340 | [1] | 289 | [1] | 583 | [1] | 559 | [1] |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | (4) |  | (2) |  | (7) |  | (3) |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |
US - Generation [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 9,835 |  |  |  | 9,835 |  |  |  | 9,952
US - Generation [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 893 |  | 858 |  | 1,894 |  | 1,744 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 83 | [1] | 66 | [1] | 161 | [1] | 201 | [1] |
US - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 893 |  | 858 |  | 1,894 |  | 1,744 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 80 | [1] | 63 | [1] | 155 | [1] | 196 | [1] |
US - Generation [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 0 |  | 0 |  | 0 |  | 0 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 3 | [1] | 3 | [1] | 6 | [1] | 5 | [1] |
Andes - Generation [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 7,458 |  |  |  | 7,458 |  |  |  | 7,356
Andes - Generation [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 723 |  | 725 |  | 1,343 |  | 1,415 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 105 | [1] | 92 | [1] | 161 | [1] | 176 | [1] |
Andes - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 724 |  | 725 |  | 1,344 |  | 1,415 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 104 | [1] | 88 | [1] | 157 | [1] | 169 | [1] |
Andes - Generation [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | (1) |  | 0 |  | (1) |  | 0 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 1 | [1] | 4 | [1] | 4 | [1] | 7 | [1] |
Brazil - Generation [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 9,144 |  |  |  | 9,144 |  |  |  | 8,388
Brazil - Generation [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 1,533 |  | 1,230 |  | 2,978 |  | 2,659 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 115 | [1] | 78 | [1] | 185 | [1] | 121 | [1] |
Brazil - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 1,533 |  | 1,230 |  | 2,978 |  | 2,659 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 115 | [1] | 78 | [1] | 184 | [1] | 120 | [1] |
Brazil - Generation [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 0 |  | 0 |  | 0 |  | 0 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 0 | [1] | 0 | [1] | 1 | [1] | 1 | [1] |
MCAC - Generation [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 5,060 |  |  |  | 5,060 |  |  |  | 5,075
MCAC - Generation [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 692 |  | 694 |  | 1,329 |  | 1,363 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 105 | [1] | 108 | [1] | 174 | [1] | 167 | [1] |
MCAC - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 692 |  | 694 |  | 1,330 |  | 1,363 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 95 | [1] | 104 | [1] | 160 | [1] | 160 | [1] |
MCAC - Generation [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 0 |  | 0 |  | (1) |  | 0 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 10 | [1] | 4 | [1] | 14 | [1] | 7 | [1] |
EMEA - Generation [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 4,240 |  |  |  | 4,240 |  |  |  | 4,191
EMEA - Generation [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 305 |  | 295 |  | 696 |  | 638 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 76 | [1] | 74 | [1] | 194 | [1] | 173 | [1] |
EMEA - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 305 |  | 295 |  | 696 |  | 638 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 73 | [1] | 72 | [1] | 188 | [1] | 168 | [1] |
EMEA - Generation [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 0 |  | 0 |  | 0 |  | 0 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 3 | [1] | 2 | [1] | 6 | [1] | 5 | [1] |
Asia - Generation [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 2,953 |  |  |  | 2,953 |  |  |  | 2,810
Asia - Generation [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 163 |  | 142 |  | 331 |  | 275 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 23 | [1] | 40 | [1] | 32 | [1] | 72 | [1] |
Asia - Generation [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 163 |  | 142 |  | 331 |  | 275 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 23 | [1] | 40 | [1] | 31 | [1] | 71 | [1] |
Asia - Generation [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 0 |  | 0 |  | 0 |  | 0 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | 0 | [1] | 0 | [1] | 1 | [1] | 1 | [1] |
Corporate Other And Other Eliminations [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | 743 |  |  |  | 743 |  |  |  | 921
Corporate Other And Other Eliminations [Member] | External [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 2 |  | 1 |  | 2 |  | 1 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | (167) | [1] | (169) | [1] | (324) | [1] | (351) | [1] |
Corporate Other And Other Eliminations [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | 5 |  | 3 |  | 7 |  | 4 |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | (150) | [1] | (156) | [1] | (292) | [1] | (325) | [1] |
Corporate Other And Other Eliminations [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |
Total Revenue | (3) |  | (2) |  | (5) |  | (3) |  |
Adjusted PTC |  |  |  |  |  |  |  |  |
Adjusted Pretax Contribution | (17) | [1] | (13) | [1] | (32) | [1] | (26) | [1] |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Total Assets | $ 0 |  |  |  | $ 0 |  |  |  | $ 1,718
[1] | Adjusted pretax contribution in each segment before intersegment eliminations includes the effect of intercompany transactions with other segments except for interest, charges for certain management fees and the write-off of intercompany balances.

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