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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,622 | $ 2,837 | $ 2,537 | $ 2,740 | $ 2,643 | $ 2,693 | $ 2,613 | $ 2,581 | $ 10,736 | $ 10,530 | $ 10,281
Property, plant and equipment, net |  | 21,396 |  |  |  | 20,296 |  |  |  | 21,396 | 20,296 |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | 3,462 | 3,487 | 3,790
Property, plant and equipment, net | [1] | 8,731 |  |  |  | 7,968 |  |  |  | 8,731 | 7,968 |
Total Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 7,274 | 7,043 | 6,491
Property, plant and equipment, net |  | 12,665 |  |  |  | 12,328 |  |  |  | 12,665 | 12,328 |
Brazil |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 527 | 541 | 450
Property, plant and equipment, net |  | 1,287 |  |  |  | 1,286 |  |  |  | 1,287 | 1,286 |
CHILE |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2,087 | 1,944 | 1,707
Property, plant and equipment, net |  | 5,453 |  |  |  | 5,066 |  |  |  | 5,453 | 5,066 |
Dominican Republic |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 884 | 826 | 614
Property, plant and equipment, net |  | 903 |  |  |  | 935 |  |  |  | 903 | 935 |
El Salvador |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 768 | 686 | 601
Property, plant and equipment, net |  | 334 |  |  |  | 340 |  |  |  | 334 | 340 |
Colombia |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 428 | 332 | 437
Property, plant and equipment, net |  | 302 |  |  |  | 332 |  |  |  | 302 | 332 |
PHILIPPINES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |  |  | 93 | 449 | 401
Property, plant and equipment, net | [2] | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
ARGENTINA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 487 | 435 | 359
Property, plant and equipment, net |  | 234 |  |  |  | 223 |  |  |  | 234 | 223 |
Vietnam |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  | 245 | 278 | 340
Property, plant and equipment, net | [3] | 2 |  |  |  | 2 |  |  |  | 2 | 2 |
Mexico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 399 | 352 | 342
Property, plant and equipment, net |  | 666 |  |  |  | 687 |  |  |  | 666 | 687 |
UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 390 | 328 | 337
Property, plant and equipment, net |  | 90 |  |  |  | 108 |  |  |  | 90 | 108 |
BULGARIA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 426 | 367 | 334
Property, plant and equipment, net |  | 1,183 |  |  |  | 1,290 |  |  |  | 1,183 | 1,290 |
Panama |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 438 | 338 | 312
Property, plant and equipment, net |  | 1,777 |  |  |  | 1,615 |  |  |  | 1,777 | 1,615 |
Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | 257 | 247 | 301
Property, plant and equipment, net | [1] | 553 |  |  |  | 565 |  |  |  | 553 | 565 |
JORDAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 95 | 95 | 136
Property, plant and equipment, net |  | 418 |  |  |  | 431 |  |  |  | 418 | 431 |
KAZAKHSTAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0 | 67 | 103
Property, plant and equipment, net |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Other Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 7 | 5 | $ 18
Property, plant and equipment, net |  | $ 16 |  |  |  | $ 13 |  |  |  | $ 16 | $ 13 |
[1] | Includes Puerto Rico revenues of $257 million, $247 million and $301 million for the years ended December 31, 2018, 2017 and 2016, respectively, and property, plant & equipment of $553 million and $565 million as of December 31, 2018 and 2017, respectively.
[2] | The Masinloc property, plant and equipment was classified as held-for-sale as of December 31, 2017, and deconsolidated upon completion of the sale in March 2018. See Note 23—Held-For-Sale and Dispositions for further information.
[3] | The Mong Duong II power project is operated under a build, operate and transfer contract. Future expected payments for the construction performance obligation are recognized in Loan receivable on the Consolidated Balance Sheets. See Note 18—Revenue for further information.

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