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Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue |  |  |
Total Revenue | $ 19,232 | $ 18,115 | $ 16,502
Intersegment | (1,091) | (1,192) | (1,059)
External Revenue | 18,141 | 16,923 | 15,443
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 1,377 | 1,078 | 955
Intersegment | 0 | 0 | 0
External Adjusted Pre-Tax Contribution | 1,377 | 1,078 | 955
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Unrealized derivatives gains (losses) | (118) | (11) | 2
Unrealized foreign currency gains (losses) | 18 | (38) | 38
Dispositions acquisitions gains | 206 | 0 | 0
Impairment losses | (1,936) | (271) | (322)
Debt retirement losses | (16) | (46) | (29)
Pre-tax contribution | (469) | 712 | 644
Add: Income from continuing operations before taxes, attributable to noncontrolling interests | 817 | 1,497 | 1,430
Less: Net equity in earnings of affiliates | 34 | (2) | 184
Income from continuing operations before taxes and equity in earnings of affiliates | 314 | 2,211 | 1,890
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 41,830 | 45,346 | 40,511
Depreciation and amortization | 1,394 | 1,262 | 1,178
Capital Expenditures | 2,270 | 2,461 | 2,333
Interest income | 349 | 399 | 407
Interest expense | 1,572 | 1,553 | 1,449
Investments in and advances to affiliates | 1,196 | 1,422 | 1,320
Less: Net equity in earnings of affiliates | 34 | (2) | 184
Property Plant And Equipment, Net | 25,913 | 25,001 |
United States [Member] |  |  |
Revenue |  |  |
Total Revenue | 3,764 | 2,113 | 1,952
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 7,663 | 7,730 |
Brazil [Member] |  |  |
Revenue |  |  |
Total Revenue | 5,788 | 6,640 | 6,355
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 5,756 | 5,896 |
Chile [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,679 | 1,608 | 1,355
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 2,993 | 2,781 |
Argentina [Member] |  |  |
Revenue |  |  |
Total Revenue | 857 | 979 | 771
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 278 | 293 |
El Salvador [Member] |  |  |
Revenue |  |  |
Total Revenue | 850 | 752 | 648
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 267 | 268 |
Dominican Republic [Member] |  |  |
Revenue |  |  |
Total Revenue | 761 | 674 | 535
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 670 | 662 |
Philippines [Member] |  |  |
Revenue |  |  |
Total Revenue | 559 | 480 | 501
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 800 | 766 |
United Kingdom [Member] |  |  |
Revenue |  |  |
Total Revenue | 505 | 587 | 364
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 579 | 523 |
Ukraine [Member] |  |  |
Revenue |  |  |
Total Revenue | 491 | 418 | 356
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 112 | 94 |
Cameroon [Member] |  |  |
Revenue |  |  |
Total Revenue | 457 | 386 | 422
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 989 | 901 |
Colombia [Member] |  |  |
Revenue |  |  |
Total Revenue | 453 | 365 | 393
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 383 | 384 |
Mexico [Member] |  |  |
Revenue |  |  |
Total Revenue | 397 | 404 | 409
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 759 | 779 |
Bulgaria [Member] |  |  |
Revenue |  |  |
Total Revenue | 369 | 251 | 44
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 1,611 | 1,624 |
Puerto Rico [Member] |  |  |
Revenue |  |  |
Total Revenue | 293 | 298 | 253
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 570 | 581 |
Panama [Member] |  |  |
Revenue |  |  |
Total Revenue | 266 | 189 | 194
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 1,069 | 1,040 |
Sri Lanka [Member] |  |  |
Revenue |  |  |
Total Revenue | 169 | 140 | 100
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 8 | 22 |
Kazakhstan [Member] |  |  |
Revenue |  |  |
Total Revenue | 151 | 145 | 138
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 141 | 86 |
Jordan [Member] |  |  |
Revenue |  |  |
Total Revenue | 121 | 124 | 120
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 222 | 216 |
Spain [Member] |  |  |
Revenue |  |  |
Total Revenue | 119 | 258 | 411
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 0 | 0 |
Hungary [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 10
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 0 | 0 |
Qatar [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 0 | 0 |
Pakistan [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 0 | 0 |
Oman [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 0 | 0 |
Vietnam [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 887 | 138 |
Other Non Us [Member] |  |  |
Revenue |  |  |
Total Revenue | 92 | 112 | 112
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 156 | 217 |
Total Non Us [Member] |  |  |
Revenue |  |  |
Total Revenue | 14,377 | 14,810 | 13,491
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net | 18,250 | 17,271 |
US Generation [Member] |  |  |
Revenue |  |  |
Total Revenue | 861 | 784 | 806
Intersegment | 0 | (2) | 0
External Revenue | 861 | 782 | 806
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 171 | 101 | 75
Intersegment | 38 | 51 | 6
External Adjusted Pre-Tax Contribution | 209 | 152 | 81
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 0 | 0 | (2)
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 3,259 | 3,461 | 3,550
Depreciation and amortization | 129 | 131 | 148
Capital Expenditures | 75 | 174 | 290
Investments in and advances to affiliates | (1) | (1) | 0
Less: Net equity in earnings of affiliates | 0 | 0 | (2)
US Utilities [Member] |  |  |
Revenue |  |  |
Total Revenue | 2,898 | 1,326 | 1,145
Intersegment | 0 | 0 | 0
External Revenue | 2,898 | 1,326 | 1,145
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 239 | 80 | 130
Intersegment | 2 | 1 | 2
External Adjusted Pre-Tax Contribution | 241 | 81 | 132
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 7,534 | 9,397 | 3,138
Depreciation and amortization | 396 | 178 | 161
Capital Expenditures | 324 | 232 | 177
Investments in and advances to affiliates | 1 | 0 | 0
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Andes Generation [Member] |  |  |
Revenue |  |  |
Total Revenue | 3,020 | 2,989 | 2,519
Intersegment | (33) | (36) | 0
External Revenue | 2,987 | 2,953 | 2,519
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 369 | 508 | 322
Intersegment | (16) | (32) | 6
External Adjusted Pre-Tax Contribution | 353 | 476 | 328
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 18 | 35 | 48
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 6,619 | 6,482 | 6,164
Depreciation and amortization | 174 | 151 | 123
Capital Expenditures | 389 | 385 | 463
Investments in and advances to affiliates | 198 | 188 | 150
Less: Net equity in earnings of affiliates | 18 | 35 | 48
Brazil Generation [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,087 | 1,128 | 1,031
Intersegment | (1,019) | (1,109) | (1,015)
External Revenue | 68 | 19 | 16
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 169 | 189 | 177
Intersegment | (244) | (267) | (251)
External Adjusted Pre-Tax Contribution | (75) | (78) | (74)
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 1,590 | 1,777 | 2,035
Depreciation and amortization | 53 | 59 | 40
Capital Expenditures | 65 | 105 | 58
Investments in and advances to affiliates | 0 | 0 | 0
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Brazil Utilities [Member] |  |  |
Revenue |  |  |
Total Revenue | 5,720 | 6,621 | 6,340
Intersegment | 0 | 0 | 0
External Revenue | 5,720 | 6,621 | 6,340
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 152 | 226 | 214
Intersegment | 165 | 179 | 192
External Adjusted Pre-Tax Contribution | 317 | 405 | 406
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 8,120 | 8,825 | 8,967
Depreciation and amortization | 228 | 273 | 211
Capital Expenditures | 652 | 633 | 559
Investments in and advances to affiliates | 0 | 0 | 0
Less: Net equity in earnings of affiliates | 0 | 0 | 0
MCAC Generation [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,723 | 1,575 | 1,400
Intersegment | (2) | (5) | (3)
External Revenue | 1,721 | 1,570 | 1,397
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 363 | 290 | 238
Intersegment | 8 | 1 | (23)
External Adjusted Pre-Tax Contribution | 371 | 291 | 215
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 5 | (2) | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 4,293 | 4,246 | 4,009
Depreciation and amortization | 112 | 94 | 94
Capital Expenditures | 160 | 183 | 136
Investments in and advances to affiliates | 24 | 19 | 20
Less: Net equity in earnings of affiliates | 5 | (2) | 0
EMEA Generation [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,376 | 1,501 | 1,208
Intersegment | (33) | (34) | (31)
External Revenue | 1,343 | 1,467 | 1,177
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 381 | 273 | 201
Intersegment | (18) | (4) | 4
External Adjusted Pre-Tax Contribution | 363 | 269 | 205
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 8 | 10 | 20
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 4,578 | 4,491 | 4,302
Depreciation and amortization | 150 | 165 | 136
Capital Expenditures | 229 | 329 | 343
Investments in and advances to affiliates | 454 | 512 | 385
Less: Net equity in earnings of affiliates | 8 | 10 | 20
Asia Generation [Member] |  |  |
Revenue |  |  |
Total Revenue | 738 | 626 | 618
Intersegment | 0 | 0 | 0
External Revenue | 738 | 626 | 618
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | 201 | 99 | 145
Intersegment | 2 | 2 | 2
External Adjusted Pre-Tax Contribution | 203 | 101 | 147
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 32 | 5 | 6
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 2,625 | 1,830 | 1,861
Depreciation and amortization | 32 | 33 | 33
Capital Expenditures | 229 | 177 | 24
Investments in and advances to affiliates | 202 | 366 | 478
Less: Net equity in earnings of affiliates | 32 | 5 | 6
Corporate Other And Other Eliminations [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,809 | 1,565 | 1,435
Intersegment | (4) | (6) | (10)
External Revenue | 1,805 | 1,559 | 1,425
Adjusted PTC |  |  |
Adjusted Pre-Tax Contribution | (668) | (688) | (547)
Intersegment | 63 | 69 | 62
External Adjusted Pre-Tax Contribution | (605) | (619) | (485)
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | (29) | (50) | 112
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 3,187 | 3,212 | 3,694
Depreciation and amortization | 117 | 110 | 110
Capital Expenditures | 138 | 151 | 176
Investments in and advances to affiliates | 318 | 338 | 287
Less: Net equity in earnings of affiliates | (29) | (50) | 112
Segment Discontinued Operations [Member] |  |  |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Segment Reporting Information, Additional Information [Abstract] |  |  |
Total Assets | 25 | 1,625 | 2,791
Depreciation and amortization | 3 | 68 | 122
Capital Expenditures | 9 | 92 | 107
Investments in and advances to affiliates | 0 | 0 | 0
Less: Net equity in earnings of affiliates | 0 | 0 | 0
Segment Discontinued Operations [Member] | United States [Member] |  |  |
Revenue |  |  |
Total Revenue | 39 | 374 | 662
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net |  | 619 |
Segment Discontinued Operations [Member] | Brazil [Member] |  |  |
Revenue |  |  |
Total Revenue |  | 124 | 118
Segment Discontinued Operations [Member] | Argentina [Member] |  |  |
Revenue |  |  |
Total Revenue |  | 102 | 116
Segment Discontinued Operations [Member] | United Kingdom [Member] |  |  |
Revenue |  |  |
Total Revenue | 5 | 17 | 21
Segment Discontinued Operations [Member] | Spain [Member] |  |  |
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net |  | 620 |
Segment Discontinued Operations [Member] | Hungary [Member] |  |  |
Revenue |  |  |
Total Revenue | 18 | 219 | 287
Segment Reporting Information, Additional Information [Abstract] |  |  |
Property Plant And Equipment, Net |  | 5 |
Segment Discontinued Operations [Member] | Qatar [Member] |  |  |
Revenue |  |  |
Total Revenue |  |  | 129
Segment Discontinued Operations [Member] | Pakistan [Member] |  |  |
Revenue |  |  |
Total Revenue |  |  | 299
Segment Discontinued Operations [Member] | Oman [Member] |  |  |
Revenue |  |  |
Total Revenue |  |  | 62
Segment Discontinued Operations [Member] | Vietnam [Member] |  |  |
Revenue |  |  |
Total Revenue |  | 1 |
Segment Discontinued Operations [Member] | Other Non Us [Member] |  |  |
Revenue |  |  |
Total Revenue | 1 |  |
Segment Discontinued Operations [Member] | Total Non Us [Member] |  |  |
Revenue |  |  |
Total Revenue | $ 24 |  |

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