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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 2,537 | $ 2,613 | $ 5,277 | $ 5,194
Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 706 |  | 1,417 |
Other non-606 revenue | 10 |  | 21 |
Revenues | 716 |  | 1,438 |
Non-regulated revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,627 |  | 3,438 |
Other non-606 revenue | 194 |  | 401 |
Revenues | 1,821 |  | 3,839 |
US and Utilities [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 995 |  | 2,022 |
US and Utilities [Domain] | Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 706 |  | 1,417 |
Other non-606 revenue | 10 |  | 21 |
Revenues | 716 |  | 1,438 |
US and Utilities [Domain] | Non-regulated revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 180 |  | 388 |
Other non-606 revenue | 99 |  | 196 |
Revenues | 279 |  | 584 |
South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 846 |  | 1,741 |
South America [Member] | Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 |  | 0 |
Other non-606 revenue | 0 |  | 0 |
Revenues | 0 |  | 0 |
South America [Member] | Non-regulated revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 845 |  | 1,739 |
Other non-606 revenue | 1 |  | 2 |
Revenues | 846 |  | 1,741 |
MCAC [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 406 |  | 814 |
MCAC [Member] | Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 |  | 0 |
Other non-606 revenue | 0 |  | 0 |
Revenues | 0 |  | 0 |
MCAC [Member] | Non-regulated revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 384 |  | 771 |
Other non-606 revenue | 22 |  | 43 |
Revenues | 406 |  | 814 |
Eurasia - Generation [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 292 |  | 711 |
Eurasia - Generation [Member] | Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 |  | 0 |
Other non-606 revenue | 0 |  | 0 |
Revenues | 0 |  | 0 |
Eurasia - Generation [Member] | Non-regulated revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 218 |  | 549 |
Other non-606 revenue | 74 |  | 162 |
Revenues | 292 |  | 711 |
Corporate Other And Other Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (2) |  | (11) |
Corporate Other And Other Eliminations [Member] | Regulated Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 |  | 0 |
Other non-606 revenue | 0 |  | 0 |
Revenues | 0 |  | 0 |
Corporate Other And Other Eliminations [Member] | Non-regulated revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 |  | (9) |
Other non-606 revenue | (2) |  | (2) |
Revenues | $ (2) |  | $ (11) |

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