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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.