Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 2,770	$ 3,036	$ 2,700	$ 2,635	$ 2,560	$ 2,545	$ 2,217	$ 2,338	$ 11,141		$ 9,660		$ 10,189
Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									2,831		2,626		2,979
Other non-606 revenue									37		35		49
Revenues									2,868		2,661		3,028
Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									7,586		6,418		6,555
Other non-606 revenue									687	[1]	581	[1]	606
Revenues									8,273		6,999		7,161
US and Utilities [Domain]
Disaggregation of Revenue [Line Items]
Revenues									4,335		3,918		4,058
US and Utilities [Domain] | Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									2,831		2,626		2,979
Other non-606 revenue									37		35		49
Revenues									2,868		2,661		3,028
US and Utilities [Domain] | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									1,132		1,015		767
Other non-606 revenue									335	[1]	242	[1]	263
Revenues									1,467		1,257		1,030
South America
Disaggregation of Revenue [Line Items]
Revenues									3,541		3,159		3,208
South America | Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									0		0		0
Other non-606 revenue									0		0		0
Revenues									0		0		0
South America | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									3,531		3,151		3,205
Other non-606 revenue									10	[1]	8	[1]	3
Revenues									3,541		3,159		3,208
MCAC [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,157		1,766		1,882
MCAC [Member] | Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									0		0		0
Other non-606 revenue									0		0		0
Revenues									0		0		0
MCAC [Member] | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									2,057		1,668		1,788
Other non-606 revenue									100	[1]	98	[1]	94
Revenues									2,157		1,766		1,882
EURASIA [Member]
Disaggregation of Revenue [Line Items]
Revenues									1,123		828		1,047
EURASIA [Member] | Regulated Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									0		0		0
Other non-606 revenue									0		0		0
Revenues									0		0		0
EURASIA [Member] | Non-regulated revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax									881		594		799
Other non-606 revenue									242	[1]	234	[1]	248
Revenues									1,123		828		1,047
Corporate Other And Other Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues									(15)		(11)		(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
Other non-606 revenue									0		0		0
Revenues									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									(15)		(10)		(4)
Other non-606 revenue									0	[1]	(1)	[1]	(2)
Revenues									$ (15)		$ (11)		$ (6)

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