Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 3,078	$ 2,700	$ 5,930		$ 5,335
Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	794	659	1,622		1,357
Other non-606 revenue	8	12	15		21
Revenue	802	671	1,637		1,378
Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,083	1,868	3,998		3,691
Other non-606 revenue	193	161	295	[1]	266	[1]
Revenue	2,276	2,029	4,293		3,957
US and Utilities [Domain]
Disaggregation of Revenue [Line Items]
Revenue	1,197	972	2,314		1,921
US and Utilities [Domain] | Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	794	659	1,622		1,357
Other non-606 revenue	8	12	15		21
Revenue	802	671	1,637		1,378
US and Utilities [Domain] | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	281	232	550		456
Other non-606 revenue	114	69	127	[1]	87	[1]
Revenue	395	301	677		543
MCAC [Member]
Disaggregation of Revenue [Line Items]
Revenue	686	490	1,252		1,025
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	662	465	1,203		975
Other non-606 revenue	24	25	49	[1]	50	[1]
Revenue	686	490	1,252		1,025
Eurasia - Generation [Member]
Disaggregation of Revenue [Line Items]
Revenue	318	277	686		547
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	266	215	575		424
Other non-606 revenue	52	62	111	[1]	123	[1]
Revenue	318	277	686		547
Corporate Other And Other Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenue	(3)	(3)	(12)		(6)
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	(3)	(3)	(12)		(6)
Other non-606 revenue	0	0	0	[1]	0	[1]
Revenue	(3)	(3)	(12)		(6)
South American SBU
Disaggregation of Revenue [Line Items]
Revenue	880	964	1,690		1,848
South American SBU | 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 American SBU | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	877	959	1,682		1,842
Other non-606 revenue	3	5	8	[1]	6	[1]
Revenue	$ 880	$ 964	$ 1,690		$ 1,848

[1] Other non-regulated revenue primarily includes lease and derivative revenue not accounted for under ASC 606.