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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenue $ 2,852 $ 2,635
Regulated Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 828 698
Other non-606 revenue 7 9
Revenue 835 707
Non-regulated revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 1,915 1,823
Other non-606 revenue 102 105 [1]
Revenue 2,017 1,928
US and Utilities [Domain]    
Disaggregation of Revenue [Line Items]    
Revenue 1,117 949
US and Utilities [Domain] | Regulated Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 828 698
Other non-606 revenue 7 9
Revenue 835 707
US and Utilities [Domain] | Non-regulated revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 269 224
Other non-606 revenue 13 18 [1]
Revenue 282 242
MCAC [Member]    
Disaggregation of Revenue [Line Items]    
Revenue 566 535
MCAC [Member] | Regulated Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 0 0
Other non-606 revenue 0 0
Revenue 0 0
MCAC [Member] | Non-regulated revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 541 510
Other non-606 revenue 25 25 [1]
Revenue 566 535
Eurasia - Generation [Member]    
Disaggregation of Revenue [Line Items]    
Revenue 368 270
Eurasia - Generation [Member] | Regulated Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 0 0
Other non-606 revenue 0 0
Revenue 0 0
Eurasia - Generation [Member] | Non-regulated revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 309 209
Other non-606 revenue 59 61 [1]
Revenue 368 270
Corporate Other And Other Eliminations [Member]    
Disaggregation of Revenue [Line Items]    
Revenue (9) (3)
Corporate Other And Other Eliminations [Member] | Regulated Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 0 0
Other non-606 revenue 0 0
Revenue 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 (9) (3)
Other non-606 revenue 0 0 [1]
Revenue (9) (3)
South American SBU    
Disaggregation of Revenue [Line Items]    
Revenue 810 884
South American SBU | Regulated Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 0 0
Other non-606 revenue 0 0
Revenue 0 0
South American SBU | Non-regulated revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Including Assessed Tax 805 883
Other non-606 revenue 5 1 [1]
Revenue $ 810 $ 884
[1] Other non-regulated revenue primarily includes lease and derivative revenue not accounted for under ASC 606.