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Segments and Geographic Information Segment and Geographic Information (Revenue and Assets by Country) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | $ 14,963 | $ 17,146 | $ 15,891
Property, plant and equipment, net |  | 22,816 | 25,151 |
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | [1] | 3,597 | 3,828 | 3,630
Property, plant and equipment, net | [1] | 8,028 | 7,713 |
United States | Discontinued Operations |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  |  | 2 | 23
Total Non-U.S. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 11,366 | 13,318 | 12,261
Property, plant and equipment, net |  | 14,788 | 17,438 |
Brazil |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 4,666 | 6,009 | 5,015
Property, plant and equipment, net |  | 3,286 | 4,725 |
Chile |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 1,523 | 1,624 | 1,569
Property, plant and equipment, net |  | 4,596 | 4,012 |
El Salvador |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 736 | 832 | 860
Property, plant and equipment, net |  | 318 | 304 |
Dominican Republic |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 632 | 802 | 832
Property, plant and equipment, net |  | 783 | 702 |
Colombia |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 557 | 552 | 523
Property, plant and equipment, net |  | 446 | 430 |
United Kingdom |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 396 | 533 | 558
Property, plant and equipment, net |  | 191 | 324 |
Argentina |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 399 | 463 | 545
Property, plant and equipment, net |  | 193 | 222 |
Philippines |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 406 | 451 | 497
Property, plant and equipment, net |  | 736 | 752 |
Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 383 | 434 | 440
Property, plant and equipment, net |  | 716 | 733 |
Bulgaria |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 382 | 410 | 422
Property, plant and equipment, net |  | 1,259 | 1,457 |
Puerto Rico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 302 | 348 | 328
Property, plant and equipment, net |  | 599 | 551 |
Panama |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 297 | 263 | 250
Property, plant and equipment, net |  | 1,028 | 1,030 |
Jordan |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 248 | 262 | 142
Property, plant and equipment, net |  | 470 | 484 |
Kazahkstan |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 155 | 161 | 156
Property, plant and equipment, net |  | 146 | 206 |
SRI LANKA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  | 45 | 107 | 53
Property, plant and equipment, net |  | 0 | 7 |
Cameroon |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | [2] | 0 | 0 | 0
Property, plant and equipment, net | [2] | 0 | 0 |
Cameroon | Discontinued Operations |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  |  | 230 | 473
Ukraine |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | [3] | 0 | 0 | 0
Property, plant and equipment, net | [3] | 0 | 0 |
Ukraine | Discontinued Operations |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  |  |  | 187
Vietnam |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | [4] | 233 | 0 | 0
Property, plant and equipment, net | [4] | 2 | 1,491 |
Other Non-U.S. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | [5] | 6 | 67 | 71
Property, plant and equipment, net | [5] | $ 19 | $ 8 |
Other Non-U.S. | Discontinued Operations |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue |  |  |  | $ 6
[1] | (1)Excludes revenue of $2 million and $23 million for the years ended December 31, 2014 and 2013, respectively, related to Condon and Mid-West Wind, which are reflected as discontinued operations in the accompanying Consolidated Statements of Operations.
[2] | (3) Excludes revenue of $230 million and $473 million for the years ended December 31, 2014 and 2013, respectively, related to Sonel, which is reflected as discontinued operations in the accompanying Consolidated Statements of Operations.
[3] | (4) Excludes revenue of $187 million for the years ended December 31, 2013 related to Kievoblenergo and Rivnooblenergo, which are reflected as discontinued operations in the accompanying Consolidated Statements of Operations.
[4] | (2) Property, plant & equipment as of December 31, 2015 includes the impact of adopting ASU No. 2014-05, Service Concession Arrangements, on a modified retrospective basis as of January 1, 2015. See Note 1—General and Summary of Significant Accounting Policies for more information.
[5] | (5) Excludes revenue of $6 million for the years ended December 31, 2013 related to Saurashtra, which is reflected as discontinued operations in the accompanying Consolidated Statements of Operations.

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