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Segments and Geographic Information Segment and Geographic Information (Revenue and Assets by Country) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,643 | $ 2,693 | $ 2,613 | $ 2,581 | $ 2,660 | $ 2,639 | $ 2,452 | $ 2,530 | $ 10,530 | $ 10,281 | $ 11,260
Property, plant and equipment, net |  | 20,296 |  |  |  | 20,415 |  |  |  | 20,296 | 20,415 |
US SBU |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 3,240 | 3,489 | 3,597
Property, plant and equipment, net |  | 7,403 |  |  |  | 7,397 |  |  |  | 7,403 | 7,397 |
Total Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 7,290 | 6,792 | 7,663
Property, plant and equipment, net |  | 12,893 |  |  |  | 13,018 |  |  |  | 12,893 | 13,018 |
Brazil |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 541 | 450 | 962
Property, plant and equipment, net |  | 1,286 |  |  |  | 789 |  |  |  | 1,286 | 789 |
CHILE |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,944 | 1,707 | 1,523
Property, plant and equipment, net |  | 5,066 |  |  |  | 4,995 |  |  |  | 5,066 | 4,995 |
Dominican Republic |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 826 | 614 | 632
Property, plant and equipment, net |  | 935 |  |  |  | 914 |  |  |  | 935 | 914 |
El Salvador |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 686 | 601 | 736
Property, plant and equipment, net |  | 340 |  |  |  | 327 |  |  |  | 340 | 327 |
Colombia |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 332 | 437 | 557
Property, plant and equipment, net |  | 332 |  |  |  | 451 |  |  |  | 332 | 451 |
PHILIPPINES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 449 | 401 | 406
Property, plant and equipment, net |  | 0 |  |  |  | 866 |  |  |  | 0 | 866 |
ARGENTINA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 435 | 359 | 399
Property, plant and equipment, net |  | 223 |  |  |  | 195 |  |  |  | 223 | 195 |
Mexico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 352 | 342 | 383
Property, plant and equipment, net |  | 687 |  |  |  | 699 |  |  |  | 687 | 699 |
Vietnam |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 278 | 340 | 233
Property, plant and equipment, net | [1] | 2 |  |  |  | 1 |  |  |  | 2 | 1 |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 328 | 337 | 396
Property, plant and equipment, net |  | 108 |  |  |  | 151 |  |  |  | 108 | 151 |
BULGARIA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 367 | 334 | 382
Property, plant and equipment, net |  | 1,290 |  |  |  | 1,174 |  |  |  | 1,290 | 1,174 |
Panama |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 338 | 312 | 297
Property, plant and equipment, net |  | 1,615 |  |  |  | 1,233 |  |  |  | 1,615 | 1,233 |
Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 247 | 301 | 302
Property, plant and equipment, net |  | 565 |  |  |  | 583 |  |  |  | 565 | 583 |
JORDAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 95 | 136 | 248
Property, plant and equipment, net |  | 431 |  |  |  | 452 |  |  |  | 431 | 452 |
KAZAKHSTAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 67 | 103 | 155
Property, plant and equipment, net |  | 0 |  |  |  | 178 |  |  |  | 0 | 178 |
Other Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 5 | 18 | $ 52
Property, plant and equipment, net |  | $ 13 |  |  |  | $ 10 |  |  |  | $ 13 | $ 10 |
[1] | The Mong Duong II power project is accounted for as a service concession arrangement. Costs of construction of the plant have been deferred in Service concession assets on the Consolidated Balance Sheets.

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