Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 2,483	$ 2,537	$ 5,133	$ 5,277
Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	706	706	1,484	1,417
Other non-606 revenue	18	10	25	21
Revenue	724	716	1,509	1,438
Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,598	1,627	3,310	3,438
Other non-606 revenue	161	194	314	401
Revenue	1,759	1,821	3,624	3,839
US and Utilities [Domain]
Disaggregation of Revenue [Line Items]
Revenue	976	995	1,995	2,022
US and Utilities [Domain] \| Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	706	706	1,484	1,417
Other non-606 revenue	18	10	25	21
Revenue	724	716	1,509	1,438
US and Utilities [Domain] \| Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	180	180	353	388
Other non-606 revenue	72	99	133	196
Revenue	252	279	486	584
South America [Member]
Disaggregation of Revenue [Line Items]
Revenue	765	846	1,610	1,741
South America [Member] \| Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Other non-606 revenue	0	0	0	0
Revenue	0	0	0	0
South America [Member] \| Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	764	845	1,607	1,739
Other non-606 revenue	1	1	3	2
Revenue	765	846	1,610	1,741
MCAC [Member]
Disaggregation of Revenue [Line Items]
Revenue	478	406	928	814
MCAC [Member] \| Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Other non-606 revenue	0	0	0	0
Revenue	0	0	0	0
MCAC [Member] \| Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	455	384	884	771
Other non-606 revenue	23	22	44	43
Revenue	478	406	928	814
Eurasia - Generation [Member]
Disaggregation of Revenue [Line Items]
Revenue	265	292	604	711
Eurasia - Generation [Member] \| Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Other non-606 revenue	0	0	0	0
Revenue	0	0	0	0
Eurasia - Generation [Member] \| Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	201	218	468	549
Other non-606 revenue	64	74	136	162
Revenue	265	292	604	711
Corporate Other And Other Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenue	(1)	(2)	(4)	(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	0	0
Other non-606 revenue	0	0	0	0
Revenue	0	0	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	(2)	0	(2)	(9)
Other non-606 revenue	1	(2)	(2)	(2)
Revenue	$ (1)	$ (2)	$ (4)	$ (11)

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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section S99
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