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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