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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Electrical Distribution Revenue | $ 722 | $ 813
Electrical Generation Revenue | 2,018 | $ 1,768
Revenues | 2,740 |
Regulated Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 711 |
Other non-606 revenue | 11 |
Non-regulated revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,811 |
Other non-606 revenue | 207 |
US and Utilities [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Electrical Distribution Revenue | 722 |
Electrical Generation Revenue | 305 |
Revenues | 1,027 |
US and Utilities [Domain] | Regulated Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 711 |
Other non-606 revenue | 11 |
US and Utilities [Domain] | Non-regulated revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 208 |
Other non-606 revenue | 97 |
South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Electrical Distribution Revenue | 0 |
Electrical Generation Revenue | 895 |
Revenues | 895 |
South America [Member] | Regulated Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 |
Other non-606 revenue | 0 |
South America [Member] | Non-regulated revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 894 |
Other non-606 revenue | 1 |
MCAC - Generation [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Electrical Distribution Revenue | 0 |
Electrical Generation Revenue | 408 |
Revenues | 408 |
MCAC - Generation [Member] | Regulated Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 |
Other non-606 revenue | 0 |
MCAC - Generation [Member] | Non-regulated revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 387 |
Other non-606 revenue | 21 |
Eurasia - Generation [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Electrical Distribution Revenue | 0 |
Electrical Generation Revenue | 419 |
Revenues | 419 |
Eurasia - Generation [Member] | Regulated Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 |
Other non-606 revenue | 0 |
Eurasia - Generation [Member] | Non-regulated revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 331 |
Other non-606 revenue | 88 |
Corporate Other And Other Eliminations [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Electrical Distribution Revenue | 0 |
Electrical Generation Revenue | (9) |
Revenues | (9) |
Corporate Other And Other Eliminations [Member] | Regulated Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 |
Other non-606 revenue | 0 |
Corporate Other And Other Eliminations [Member] | Non-regulated revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (9) |
Other non-606 revenue | $ 0 |

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- Definition Revenue earned during the period from the delivery of electricity to a retail customer's home or business through distribution wires or facilities of regulated public utilities. Also known as power delivery revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Revenue from generation of electricity, a process of producing electric energy by transforming other forms of energy such as nuclear, fossil fuel, solar, geothermal, hydro, and wind. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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