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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,431 | $ 2,625 | $ 2,483 | $ 2,650 | $ 2,622 | $ 2,837 | $ 2,537 | $ 2,740 | $ 10,189 | $ 10,736 | $ 10,530
Property, plant and equipment, net |  | 22,574 |  |  |  | 21,396 |  |  |  | 22,574 | 21,396 |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | 3,230 | 3,462 | 3,487
Property, plant and equipment, net | [1] | 9,706 |  |  |  | 8,731 |  |  |  | 9,706 | 8,731 |
Total Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 6,959 | 7,274 | 7,043
Property, plant and equipment, net |  | 12,868 |  |  |  | 12,665 |  |  |  | 12,868 | 12,665 |
PHILIPPINES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |  |  | 0 | 93 | 449
Property, plant and equipment, net | [2] | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Brazil |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 525 | 527 | 541
Property, plant and equipment, net |  | 1,260 |  |  |  | 1,287 |  |  |  | 1,260 | 1,287 |
CHILE |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,839 | 2,087 | 1,944
Property, plant and equipment, net |  | 5,939 |  |  |  | 5,453 |  |  |  | 5,939 | 5,453 |
Dominican Republic |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 877 | 884 | 826
Property, plant and equipment, net |  | 1,002 |  |  |  | 903 |  |  |  | 1,002 | 903 |
El Salvador |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 824 | 768 | 686
Property, plant and equipment, net |  | 343 |  |  |  | 334 |  |  |  | 343 | 334 |
Colombia |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 472 | 428 | 332
Property, plant and equipment, net |  | 340 |  |  |  | 302 |  |  |  | 340 | 302 |
ARGENTINA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 373 | 487 | 435
Property, plant and equipment, net |  | 392 |  |  |  | 234 |  |  |  | 392 | 234 |
Vietnam |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  | 343 | 245 | 278
Property, plant and equipment, net | [3] | 2 |  |  |  | 2 |  |  |  | 2 | 2 |
Mexico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 402 | 399 | 352
Property, plant and equipment, net |  | 648 |  |  |  | 666 |  |  |  | 648 | 666 |
UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [4] |  |  |  |  |  |  |  |  | 147 | 390 | 328
Property, plant and equipment, net | [4] | 0 |  |  |  | 90 |  |  |  | 0 | 90 |
BULGARIA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 459 | 426 | 367
Property, plant and equipment, net |  | 1,104 |  |  |  | 1,183 |  |  |  | 1,104 | 1,183 |
Panama |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 601 | 438 | 338
Property, plant and equipment, net |  | 1,819 |  |  |  | 1,777 |  |  |  | 1,819 | 1,777 |
Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | 294 | 257 | 247
Property, plant and equipment, net | [1] | 538 |  |  |  | 553 |  |  |  | 538 | 553 |
JORDAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [5] |  |  |  |  |  |  |  |  | 95 | 95 | 95
Property, plant and equipment, net | [5] | 0 |  |  |  | 418 |  |  |  | 0 | 418 |
KAZAKHSTAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0 | 0 | 67
Property, plant and equipment, net |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Other Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2 | 7 | $ 5
Property, plant and equipment, net |  | $ 19 |  |  |  | $ 16 |  |  |  | $ 19 | $ 16 |
[1] | Includes Puerto Rico revenues of $294 million, $257 million and $247 million for the years ended December 31, 2019, 2018 and 2017, respectively, and property, plant & equipment of $538 million and $553 million as of December 31, 2019 and 2018, 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 25—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 20—Revenue for further information.
[4] | The Kilroot and Ballylumford property, plant and equipment was deconsolidated upon completion of the sale in June 2019. See Note 25—Held-For-Sale and Dispositions for further information.
[5] | The property, plant and equipment in Jordan was classified as held-for-sale as of December 31, 2019. See Note 25—Held-For-Sale and Dispositions for further information.

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