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Condensed Statements of Consolidated Changes in Equity (Unaudited) - CERC - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in-Capital
Retained Earnings
Accumulated Other Comprehensive Loss
CERC
CERC
Common Stock
CERC
Additional Paid-in-Capital
CERC
Retained Earnings
CERC
Accumulated Other Comprehensive Loss
Balance, beginning of period (in shares) at Dec. 31, 2021   629,000,000         1,000      
Balance, beginning of period at Dec. 31, 2021   $ 6 $ 8,529 $ 154 $ (64)   $ 0 $ 4,106 $ 1,017 $ 10
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Non-cash contribution from parent           $ 54   54    
Contribution from parent               125    
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses           720   (720)    
Net income $ 923     923   656     656  
Dividend to parent                 (124)  
Other comprehensive loss         (19)         0
Balance, end of period (in shares) at Sep. 30, 2022   629,000,000         1,000      
Balance, end of period at Sep. 30, 2022 9,989 $ 6 8,557 719 (83) 5,124 $ 0 3,565 1,549 10
Balance, beginning of period (in shares) at Jun. 30, 2022   629,000,000         1,000      
Balance, beginning of period at Jun. 30, 2022   $ 6 8,544 768 (85)   $ 0 3,565 1,569 10
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Non-cash contribution from parent           0   0    
Contribution from parent               0    
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses           0   0    
Net income 202     202   (7)     (7)  
Dividend to parent                 (13)  
Other comprehensive loss         2         0
Balance, end of period (in shares) at Sep. 30, 2022   629,000,000         1,000      
Balance, end of period at Sep. 30, 2022 $ 9,989 $ 6 8,557 719 (83) 5,124 $ 0 3,565 1,549 10
Balance, beginning of period (in shares) at Dec. 31, 2022 629,535,631 630,000,000         1,000      
Balance, beginning of period at Dec. 31, 2022 $ 10,042 $ 6 8,568 709 (31) 5,363 $ 0 3,729 1,618 16
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Non-cash contribution from parent           0   0    
Contribution from parent               500    
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses           0   0    
Net income $ 725     725   283     283  
Dividend to parent                 (347)  
Other comprehensive loss         2         (1)
Balance, end of period (in shares) at Sep. 30, 2023 631,209,962 631,000,000         1,000      
Balance, end of period at Sep. 30, 2023 $ 9,585 $ 6 8,581 1,027 (29) 5,798 $ 0 4,229 1,554 15
Balance, beginning of period (in shares) at Jun. 30, 2023   631,000,000         1,000      
Balance, beginning of period at Jun. 30, 2023   $ 6 8,570 1,032 (32)   $ 0 4,229 1,562 15
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Non-cash contribution from parent           0   0    
Contribution from parent               0    
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses           0   0    
Net income $ 282     282   28     28  
Dividend to parent                 (36)  
Other comprehensive loss         3         0
Balance, end of period (in shares) at Sep. 30, 2023 631,209,962 631,000,000         1,000      
Balance, end of period at Sep. 30, 2023 $ 9,585 $ 6 $ 8,581 $ 1,027 $ (29) $ 5,798 $ 0 $ 4,229 $ 1,554 $ 15