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Segment Information - MEC (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
reportableSegment
operatingSegment
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | operatingSegment     8    
Operating revenue $ 6,612 $ 6,064 $ 12,642 $ 12,145  
Operating income 1,207 1,208 2,443 2,541  
Interest expense (550) (532) (1,082) (1,062)  
Allowance for equity funds 42 30 80 56  
Other, net (26) 48 (21) 56  
Income (loss) before income tax expense (benefit) and equity income (loss) 3,249 2,760 2,779 2,514  
Assets 135,295   $ 135,295   $ 132,065
MEC          
Segment Reporting Information [Line Items]          
Number of reportable segments | reportableSegment     2    
Operating revenue 897 693 $ 1,902 1,760  
Operating income 90 103 190 151  
Interest expense (78) (74) (156) (148)  
Allowance for borrowed funds 5 2 9 4  
Allowance for equity funds 14 8 29 14  
Other, net (12) 15 (15) 26  
Income (loss) before income tax expense (benefit) and equity income (loss) 19 54 57 47  
Assets 23,635   23,635   23,257
MEC | Regulated electric          
Segment Reporting Information [Line Items]          
Operating revenue 725 586 1,333 1,131  
Operating income 87 103 138 112  
Assets 21,967   21,967   21,385
MEC | Regulated natural gas          
Segment Reporting Information [Line Items]          
Operating revenue 171 106 567 618  
Operating income 3 0 52 39  
Assets 1,667   1,667   1,871
MEC | Other          
Segment Reporting Information [Line Items]          
Operating revenue 1 $ 1 2 $ 11  
Assets $ 1   $ 1   $ 1