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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, 2022   630,000,000         1,000      
Balance, beginning of period at Dec. 31, 2022   $ 6 $ 8,568 $ 709 $ (31)   $ 0 $ 3,729 $ 1,618 $ 16
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Contribution from parent               500    
Net income $ 725     725   $ 283     283  
Dividend to parent                 (347)  
Other comprehensive income (loss) 2       2 (1)       (1)
Balance, end of period (in shares) at Sep. 30, 2023   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]                    
Contribution from parent               0    
Net income 282     282   28     28  
Dividend to parent                 (36)  
Other comprehensive income (loss) 3       3 0       0
Balance, end of period (in shares) at Sep. 30, 2023   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 Dec. 31, 2023 631,225,829 631,000,000         1,000      
Balance, beginning of period at Dec. 31, 2023 $ 9,667 $ 6 8,604 1,092 (35) 5,879 $ 0 4,229 1,634 16
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Contribution from parent               290    
Net income 771     771   345     345  
Dividend to parent                 (270)  
Other comprehensive income (loss) $ 5       5 (1)       (1)
Balance, end of period (in shares) at Sep. 30, 2024 651,721,174 652,000,000         1,000      
Balance, end of period at Sep. 30, 2024 $ 10,535 $ 6 9,091 1,468 (30) 6,243 $ 0 4,519 1,709 15
Balance, beginning of period (in shares) at Jun. 30, 2024   642,000,000         1,000      
Balance, beginning of period at Jun. 30, 2024   $ 6 8,836 1,542 (30)   $ 0 4,519 1,699 15
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Contribution from parent               0    
Net income 193     193   34     34  
Dividend to parent                 (24)  
Other comprehensive income (loss) $ 0       0 0       0
Balance, end of period (in shares) at Sep. 30, 2024 651,721,174 652,000,000         1,000      
Balance, end of period at Sep. 30, 2024 $ 10,535 $ 6 $ 9,091 $ 1,468 $ (30) $ 6,243 $ 0 $ 4,519 $ 1,709 $ 15