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Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Revenue |  |  |  |  |
Total Revenue | $ 4,859 | $ 4,637 | $ 14,346 | $ 13,751 |
Intersegment | (272) | (330) | (827) | (853) |
External Revenue | 4,587 | 4,307 | 13,519 | 12,898 |
Reconciliation To Income From Continuing Operations Before Taxes |  |  |  |  |
Depreciation and amortization | 327 | 303 | 1,019 | 879 |
Interest expense | (401) | (418) | (1,202) | (1,137) |
Interest income | 89 | 102 | 263 | 293 |
Other expense | (15) | (76) | (59) | (126) |
Other income | 7 | 57 | 40 | 107 |
Gain on sale of investments | 30 | 0 | 214 | 7 |
Goodwill impairment | (1,850) | (17) | (1,850) | (17) |
Asset impairment expense | (43) | (130) | (72) | (163) |
Foreign currency transaction losses | (8) | (90) | (110) | (20) |
Other non-operating expense | 0 | (82) | (50) | (82) |
Income from continuing operations before taxes and equity in earnings of affiliates | (1,251) | 266 | (277) | 1,575 |
Assets |  |  |  |  |
Total Assets | 41,356 |  | 41,356 |  | 45,346
Generation Latin America Other [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 1,036 | 984 | 3,024 | 2,984 |
Intersegment | (10) | (8) | (29) | (28) |
External Revenue | 1,026 | 976 | 2,995 | 2,956 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 301 | 258 | 820 | 852 |
Intersegment | 5 | (10) | 15 | (4) |
External Adjusted Gross Margin | 306 | 248 | 835 | 848 |
Assets |  |  |  |  |
Total Assets | 9,168 |  | 9,168 |  | 9,067
Generation Tiete [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Generation Capacity (MW) | 2,663 |  | 2,663 |  |
Revenue |  |  |  |  |
Total Revenue | 268 | 317 | 847 | 826 |
Intersegment | (260) | (320) | (790) | (813) |
External Revenue | 8 | (3) | 57 | 13 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 204 | 248 | 653 | 641 |
Intersegment | (260) | (320) | (790) | (813) |
External Adjusted Gross Margin | (56) | (72) | (137) | (172) |
Assets |  |  |  |  |
Total Assets | 1,486 |  | 1,486 |  | 1,645
Generation North America [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 359 | 334 | 1,004 | 1,007 |
Intersegment | 0 | 0 | 0 | (4) |
External Revenue | 359 | 334 | 1,004 | 1,003 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 133 | 119 | 355 | 335 |
Intersegment | 2 | 3 | 8 | 6 |
External Adjusted Gross Margin | 135 | 122 | 363 | 341 |
Assets |  |  |  |  |
Total Assets | 3,584 |  | 3,584 |  | 3,625
Generation Europe [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 245 | 397 | 928 | 1,125 |
Intersegment | 0 | 0 | (1) | (1) |
External Revenue | 245 | 397 | 927 | 1,124 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 98 | 128 | 419 | 327 |
Intersegment | 2 | 2 | (5) | 4 |
External Adjusted Gross Margin | 100 | 130 | 414 | 331 |
Assets |  |  |  |  |
Total Assets | 3,398 |  | 3,398 |  | 3,276
Generation Asia [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 191 | 172 | 553 | 449 |
Intersegment | 0 | 0 | 0 | 0 |
External Revenue | 191 | 172 | 553 | 449 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 66 | 35 | 188 | 133 |
Intersegment | 0 | 0 | 1 | 1 |
External Adjusted Gross Margin | 66 | 35 | 189 | 134 |
Assets |  |  |  |  |
Total Assets | 2,281 |  | 2,281 |  | 1,717
Utilities Latin America [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 1,667 | 1,898 | 4,847 | 5,682 |
Intersegment | 0 | 0 | 0 | 0 |
External Revenue | 1,667 | 1,898 | 4,847 | 5,682 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 147 | 381 | 358 | 1,041 |
Intersegment | 261 | 322 | 796 | 820 |
External Adjusted Gross Margin | 408 | 703 | 1,154 | 1,861 |
Assets |  |  |  |  |
Total Assets | 8,500 |  | 8,500 |  | 9,468
Utilities North America [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 796 | 321 | 2,206 | 890 |
Intersegment | 0 | 0 | 0 | 0 |
External Revenue | 796 | 321 | 2,206 | 890 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 262 | 112 | 668 | 291 |
Intersegment | 0 | 0 | 1 | 1 |
External Adjusted Gross Margin | 262 | 112 | 669 | 292 |
Assets |  |  |  |  |
Total Assets | 7,430 |  | 7,430 |  | 9,397
Segment Discontinued Operations [Member] |  |  |  |  |
Assets |  |  |  |  |
Total Assets | 24 |  | 24 |  | 1,576
Corporate Other And Other Eliminations [Member] |  |  |  |  |
Revenue |  |  |  |  |
Total Revenue | 297 | 214 | 937 | 788 |
Intersegment | (2) | (2) | (7) | (7) |
External Revenue | 295 | 212 | 930 | 781 |
Adjusted Gross Margin |  |  |  |  |
Adjusted Gross Margin | 44 | (68) | 105 | (34) |
Intersegment | 2 | 13 | (24) | (9) |
External Adjusted Gross Margin | 46 | (55) | 81 | (43) |
Assets |  |  |  |  |
Total Assets | $ 5,485 |  | $ 5,485 |  | $ 5,575

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