Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 3,627	$ 3,036	$ 9,557		$ 8,371
Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	968	760	2,590		2,117
Other non-606 revenue	8	9	23		30
Revenue	976	769	2,613		2,147
Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,514	2,015	6,512		5,706
Other non-606 revenue	137	252	432	[1]	518	[1]
Revenue	2,651	2,267	6,944		6,224
US and Utilities [Domain]
Disaggregation of Revenue [Line Items]
Revenue	1,506	1,327	3,820		3,248
US and Utilities [Domain] | Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	968	760	2,590		2,117
Other non-606 revenue	8	9	23		30
Revenue	976	769	2,613		2,147
US and Utilities [Domain] | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	491	394	1,041		850
Other non-606 revenue	39	164	166	[1]	251	[1]
Revenue	530	558	1,207		1,101
MCAC [Member]
Disaggregation of Revenue [Line Items]
Revenue	940	559	2,192		1,584
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	916	534	2,119		1,509
Other non-606 revenue	24	25	73	[1]	75	[1]
Revenue	940	559	2,192		1,584
Eurasia - Generation [Member]
Disaggregation of Revenue [Line Items]
Revenue	261	257	947		804
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	208	197	783		621
Other non-606 revenue	53	60	164	[1]	183	[1]
Revenue	261	257	947		804
Corporate Other And Other Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenue	(6)	(3)	(18)		(9)
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	(7)	(3)	(19)		(9)
Other non-606 revenue	1	0	1	[1]	0	[1]
Revenue	(6)	(3)	(18)		(9)
South American SBU
Disaggregation of Revenue [Line Items]
Revenue	926	896	2,616		2,744
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	906	893	2,588		2,735
Other non-606 revenue	20	3	28	[1]	9	[1]
Revenue	$ 926	$ 896	$ 2,616		$ 2,744

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