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

Revenues not accounted for under ASC 606, such as lease revenue, derivative revenue, alternative program revenue, etc.

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No definition available.

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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

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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

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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