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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]                    
Net income $ 325     325   $ 212     212  
Dividend to parent                 (204)  
Other comprehensive loss         (1)         (1)
Balance, end of period (in shares) at Mar. 31, 2023   631,000,000         1,000      
Balance, end of period at Mar. 31, 2023 $ 10,356 $ 6 8,558 1,034 (32) 5,370 $ 0 3,729 1,626 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]                    
Net income $ 350     350   264     264  
Dividend to parent                 (115)  
Other comprehensive loss         2         (1)
Balance, end of period (in shares) at Mar. 31, 2024 633,166,053 633,000,000         1,000      
Balance, end of period at Mar. 31, 2024 $ 9,998 $ 6 $ 8,583 $ 1,442 $ (33) $ 6,027 $ 0 $ 4,229 $ 1,783 $ 15