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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 2,560 | $ 2,545 | $ 2,217 | $ 2,338 | $ 2,431 | $ 2,625 | $ 2,483 | $ 2,650 | $ 9,660 | $ 10,189 | $ 10,736
Property, plant and equipment, net |  | 22,826 |  |  |  | 22,574 |  |  |  | 22,826 | 22,574 |
Long-Lived Assets |  | 23,103 |  |  |  | 22,822 |  |  |  | 23,103 | 22,822 |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | 3,243 | 3,230 | 3,462
Long-Lived Assets | [1] | 10,360 |  |  |  | 9,762 |  |  |  | 10,360 | 9,762 |
Total Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 6,417 | 6,959 | 7,274
Long-Lived Assets |  | 12,743 |  |  |  | 13,060 |  |  |  | 12,743 | 13,060 |
VIET NAM |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |  |  | 285 | 343 | 245
Long-Lived Assets | [2] | 0 |  |  |  | 2 |  |  |  | 0 | 2 |
PHILIPPINES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  | 0 | 0 | 93
Long-Lived Assets | [3] | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Brazil |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 401 | 525 | 527
Long-Lived Assets |  | 1,091 |  |  |  | 1,266 |  |  |  | 1,091 | 1,266 |
CHILE |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2,092 | 1,839 | 2,087
Long-Lived Assets |  | 5,831 |  |  |  | 5,982 |  |  |  | 5,831 | 5,982 |
Dominican Republic |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 896 | 877 | 884
Long-Lived Assets |  | 843 |  |  |  | 1,006 |  |  |  | 843 | 1,006 |
El Salvador |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 666 | 824 | 768
Long-Lived Assets |  | 361 |  |  |  | 351 |  |  |  | 361 | 351 |
Colombia |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 358 | 472 | 428
Long-Lived Assets |  | 355 |  |  |  | 340 |  |  |  | 355 | 340 |
ARGENTINA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 308 | 373 | 487
Long-Lived Assets |  | 484 |  |  |  | 393 |  |  |  | 484 | 393 |
Mexico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 349 | 402 | 399
Long-Lived Assets |  | 623 |  |  |  | 649 |  |  |  | 623 | 649 |
UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0 | 147 | 390
Long-Lived Assets |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
BULGARIA |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 444 | 459 | 426
Long-Lived Assets |  | 1,149 |  |  |  | 1,106 |  |  |  | 1,149 | 1,106 |
Panama |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 519 | 601 | 438
Long-Lived Assets |  | 1,939 |  |  |  | 1,945 |  |  |  | 1,939 | 1,945 |
Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | 298 | 294 | 257
Long-Lived Assets | [1] | 533 |  |  |  | 538 |  |  |  | 533 | 538 |
JORDAN |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 96 | 95 | 95
Long-Lived Assets |  | 44 |  |  |  | 0 |  |  |  | 44 | 0 |
Other Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 3 | 2 | $ 7
Long-Lived Assets |  | $ 23 |  |  |  | $ 20 |  |  |  | $ 23 | $ 20 |
[1] | Includes Puerto Rico revenues of $298 million, $294 million, and $257 million for the years ended December 31, 2020, 2019, and 2018, respectively, and long-lived assets of $533 million and $538 million as of December 31, 2020 and 2019, respectively.
[2] | The Mong Duong 2 power project is operated under a BOT contract. Future expected payments for the construction performance obligation are recognized in Loan receivable on the Consolidated Balance Sheets as of December 31, 2019. Mong Duong assets were classified as held-for-sale as of December 31, 2020. See Notes 20—Revenue and 25—Held-For-Sale and Dispositions for further information.
[3] | The Masinloc long-lived assets were deconsolidated upon completion of the sale in March 2018. See Note 25—Held-For-Sale and Dispositions for further information.

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