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Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Revenue |  |  |
Total Revenue | $ 18,291 | $ 16,717 | $ 13,850
Intersegment | (1,163) | (1,032) | (876)
Revenues | 17,128 | 15,685 | 12,974
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Depreciation and amortization | (1,176) | (1,034) | (884)
Interest expense | (1,553) | (1,451) | (1,406)
Interest income | 400 | 408 | 344
Other expense | (154) | (234) | (104)
Other income | 149 | 100 | 458
Gain on sale of investments | 8 | 0 | 132
Goodwill impairment | (17) | (21) | (122)
Asset impairment expense | (225) | (389) | (20)
Foreign Currency Transaction Gains (Losses) | (38) | (33) | 35
Other non-operating expense | (82) | (7) | (12)
Income from continuing operations before taxes and equity in earnings of affiliates | 2,167 | 1,853 | 2,260
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 45,333 | 40,511 | 39,535
Depreciation and Amortization | 1,262 | 1,178 | 1,049
Capital Expenditures | 2,461 | 2,333 | 2,538
Investment in and advances to subsidiaries and affiliates | 1,422 | 1,320 | 1,157
Equity in Earnings (Loss) | (2) | 183 | 91
Property, plant and equipment, net | 25,122 | 22,793 |
United States [Member] |  |  |
Revenue |  |  |
Total Revenue | 2,110 | 1,952 | 1,851
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 7,829 | 5,379 |
Brazil [Member] |  |  |
Revenue |  |  |
Total Revenue | 6,640 | 6,355 | 5,292
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 5,896 | 6,263 |
Chile [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,608 | 1,355 | 1,239
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 2,781 | 2,560 |
Argentina [Member] |  |  |
Revenue |  |  |
Total Revenue | 979 | 771 | 571
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 279 | 270 |
El Salvador [Member] |  |  |
Revenue |  |  |
Total Revenue | 752 | 648 | 619
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 268 | 261 |
Dominican Republic [Member] |  |  |
Revenue |  |  |
Total Revenue | 674 | 535 | 429
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 662 | 625 |
Philippines [Member] |  |  |
Revenue |  |  |
Total Revenue | 480 | 501 | 250
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 766 | 784 |
Cameroon [Member] |  |  |
Revenue |  |  |
Total Revenue | 386 | 422 | 370
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 901 | 823 |
Spain [Member] |  |  |
Revenue |  |  |
Total Revenue | 258 | 411 | 0
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 0 | 0 |
Mexico [Member] |  |  |
Revenue |  |  |
Total Revenue | 404 | 409 | 329
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 774 | 786 |
Colombia [Member] |  |  |
Revenue |  |  |
Total Revenue | 365 | 393 | 347
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 384 | 387 |
United Kingdom [Member] |  |  |
Revenue |  |  |
Total Revenue | 587 | 364 | 228
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 523 | 507 |
Ukraine [Member] |  |  |
Revenue |  |  |
Total Revenue | 418 | 356 | 286
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 94 | 86 |
Hungary [Member] |  |  |
Revenue |  |  |
Total Revenue | 204 | 252 | 259
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 6 | 73 |
Puerto Rico [Member] |  |  |
Revenue |  |  |
Total Revenue | 298 | 253 | 267
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 581 | 596 |
Panama [Member] |  |  |
Revenue |  |  |
Total Revenue | 189 | 194 | 168
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 1,040 | 921 |
Kazakhstan [Member] |  |  |
Revenue |  |  |
Total Revenue | 145 | 138 | 123
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 86 | 63 |
Jordan [Member] |  |  |
Revenue |  |  |
Total Revenue | 124 | 120 | 104
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 216 | 224 |
Sri Lanka [Member] |  |  |
Revenue |  |  |
Total Revenue | 140 | 100 | 109
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 22 | 69 |
Bulgaria [Member] |  |  |
Revenue |  |  |
Total Revenue | 251 | 44 | 0
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 1,619 | 1,825 |
Qatar [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 0 | 0 |
Pakistan [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 0 | 0 |
Oman [Member] |  |  |
Revenue |  |  |
Total Revenue | 0 | 0 | 0
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 0 | 0 |
Other Non US [Member] |  |  |
Revenue |  |  |
Total Revenue | 116 | 112 | 133
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 395 | 291 |
Total Non US [Member] |  |  |
Revenue |  |  |
Total Revenue | 15,018 | 13,733 | 11,123
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 17,293 | 17,414 |
Generation Latin America Other [Member] |  |  |
Revenue |  |  |
Total Revenue | 3,854 | 3,282 | 2,806
Intersegment | (39) | (34) | (16)
Revenues | 3,815 | 3,248 | 2,790
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 1,209 | 945 | 891
Intersegment | 20 | (27) | (4)
External Adjusted Gross Margin | 1,229 | 918 | 887
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 9,067 | 8,487 | 8,010
Depreciation and Amortization | 202 | 175 | 146
Capital Expenditures | 553 | 584 | 921
Investment in and advances to subsidiaries and affiliates | 188 | 150 | 129
Equity in Earnings (Loss) | 35 | 48 | 30
Generation Tiete [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Generation Capacity (MW) | 2,663 |  |
Revenue |  |  |
Total Revenue | 1,128 | 999 | 845
Intersegment | (1,109) | (983) | (848)
Revenues | 19 | 16 | (3)
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 876 | 754 | 637
Intersegment | (1,109) | (983) | (848)
External Adjusted Gross Margin | (233) | (229) | (211)
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 1,645 | 1,886 | 1,792
Depreciation and Amortization | 59 | 40 | 37
Capital Expenditures | 105 | 57 | 30
Investment in and advances to subsidiaries and affiliates | 0 | 0 | 0
Equity in Earnings (Loss) | 0 | 0 | 0
Generation North America [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,325 | 1,315 | 1,249
Intersegment | (4) | 0 | 0
Revenues | 1,321 | 1,315 | 1,249
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 439 | 448 | 453
Intersegment | 9 | 2 | (3)
External Adjusted Gross Margin | 448 | 450 | 450
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 3,625 | 3,801 | 4,199
Depreciation and Amortization | 118 | 131 | 135
Capital Expenditures | 39 | 54 | 45
Investment in and advances to subsidiaries and affiliates | 18 | 0 | 3
Equity in Earnings (Loss) | (2) | (2) | (2)
Generation Europe [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,550 | 1,318 | 762
Intersegment | (2) | (2) | 2
Revenues | 1,548 | 1,316 | 764
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 469 | 395 | 273
Intersegment | 8 | 3 | 4
External Adjusted Gross Margin | 477 | 398 | 277
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 3,276 | 3,317 | 3,147
Depreciation and Amortization | 136 | 114 | 53
Capital Expenditures | 140 | 233 | 212
Investment in and advances to subsidiaries and affiliates | 479 | 353 | 308
Equity in Earnings (Loss) | 8 | 19 | 50
Generation Asia [Member] |  |  |
Revenue |  |  |
Total Revenue | 625 | 618 | 375
Intersegment | 0 | 0 | 0
Revenues | 625 | 618 | 375
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 176 | 255 | 111
Intersegment | 2 | 2 | 4
External Adjusted Gross Margin | 178 | 257 | 115
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 1,717 | 1,762 | 1,594
Depreciation and Amortization | 33 | 33 | 32
Capital Expenditures | 129 | 10 | 22
Investment in and advances to subsidiaries and affiliates | 291 | 409 | 390
Equity in Earnings (Loss) | (1) | 3 | 28
Utilities Latin America [Member] |  |  |
Revenue |  |  |
Total Revenue | 7,374 | 6,987 | 5,877
Intersegment | 0 | 0 | 0
Revenues | 7,374 | 6,987 | 5,877
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 1,321 | 1,248 | 1,060
Intersegment | 1,118 | 1,018 | 865
External Adjusted Gross Margin | 2,439 | 2,266 | 1,925
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 9,468 | 9,609 | 8,810
Depreciation and Amortization | 293 | 231 | 201
Capital Expenditures | 666 | 584 | 356
Investment in and advances to subsidiaries and affiliates | 0 | 0 | 0
Equity in Earnings (Loss) | 0 | 0 | 0
Utilities North America [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,326 | 1,145 | 1,068
Intersegment | 0 | 0 | 0
Revenues | 1,326 | 1,145 | 1,068
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | 394 | 407 | 401
Intersegment | 1 | 2 | 2
External Adjusted Gross Margin | 395 | 409 | 403
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 9,384 | 3,139 | 3,035
Depreciation and Amortization | 178 | 161 | 157
Capital Expenditures | 232 | 177 | 116
Investment in and advances to subsidiaries and affiliates | 0 | 0 | 0
Equity in Earnings (Loss) | 0 | 0 | 0
Segment Discontinued Operations [Member] |  |  |
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 1,531 | 2,587 | 3,756
Depreciation and Amortization | 59 | 110 | 140
Capital Expenditures | 91 | 105 | 119
Investment in and advances to subsidiaries and affiliates | 0 | 0 | 0
Equity in Earnings (Loss) | 0 | 0 | 0
Segment Discontinued Operations [Member] | United States [Member] |  |  |
Revenue |  |  |
Total Revenue | 374 | 662 | 695
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 619 | 788 |
Segment Discontinued Operations [Member] | Brazil [Member] |  |  |
Revenue |  |  |
Total Revenue | 124 | 118 | 102
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net |  | 151 |
Segment Discontinued Operations [Member] | Argentina [Member] |  |  |
Revenue |  |  |
Total Revenue | 102 | 116 | 113
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net |  | 189 |
Segment Discontinued Operations [Member] | Spain [Member] |  |  |
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 620 | 667 |
Segment Discontinued Operations [Member] | United Kingdom [Member] |  |  |
Revenue |  |  |
Total Revenue | 17 | 21 | 11
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net |  | 20 |
Segment Discontinued Operations [Member] | Hungary [Member] |  |  |
Revenue |  |  |
Total Revenue | 14 | 44 | 58
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net |  | 7 |
Segment Discontinued Operations [Member] | Qatar [Member] |  |  |
Revenue |  |  |
Total Revenue |  | 129 | 163
Segment Discontinued Operations [Member] | Pakistan [Member] |  |  |
Revenue |  |  |
Total Revenue |  | 299 | 470
Segment Discontinued Operations [Member] | Oman [Member] |  |  |
Revenue |  |  |
Total Revenue |  | 62 | 101
Segment Discontinued Operations [Member] | Other Non US [Member] |  |  |
Revenue |  |  |
Total Revenue | 1 |  |
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Property, plant and equipment, net | 2 | 18 |
Segment Discontinued Operations [Member] | Total Non US [Member] |  |  |
Revenue |  |  |
Total Revenue | 258 |  |
Corporate Other And Other Eliminations [Member] |  |  |
Revenue |  |  |
Total Revenue | 1,109 | 1,053 | 868
Intersegment | (9) | (13) | (14)
Revenues | 1,100 | 1,040 | 854
Adjusted Gross Margin |  |  |
Adjusted Gross Margin | (33) | 62 | 3
Intersegment | (45) | (17) | (10)
External Adjusted Gross Margin | (78) | 45 | (7)
Reconciliation To Income From Continuing Operations Before Taxes |  |  |
Goodwill impairment | 0 | 3 |
Segment Reporting Entity Other Disclosures [Abstract] |  |  |
Assets | 5,620 | 5,923 | 5,192
Depreciation and Amortization | 184 | 183 | 148
Capital Expenditures | 506 | 529 | 717
Investment in and advances to subsidiaries and affiliates | 446 | 408 | 327
Equity in Earnings (Loss) | $ (42) | $ 115 | $ (15)

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