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Condensed Statements of Consolidated Changes in Equity (Unaudited) - Houston Electric - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in-Capital
Retained Earnings
Houston Electric
Houston Electric
Common Stock
Houston Electric
Additional Paid-in-Capital
Houston Electric
Retained Earnings
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   $ 0 $ 2,678 $ 944
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Non-cash contribution from parent         $ 38   38  
Contribution from parent             1,143  
Other             1  
Net income $ 923     923 408     408
Dividend to parent               (141)
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 5,071 $ 0 3,860 1,211
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   $ 0 3,860 1,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Non-cash contribution from parent         0   0  
Contribution from parent             0  
Other             0  
Net income 202     202 200     200
Dividend to parent               (74)
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 5,071 $ 0 3,860 1,211
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 4,998 $ 0 3,860 1,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Non-cash contribution from parent         0   0  
Contribution from parent             885  
Other             0  
Net income $ 725     725 522     522
Dividend to parent               (239)
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 6,166 $ 0 4,745 1,421
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   $ 0 4,510 1,244
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Non-cash contribution from parent         0   0  
Contribution from parent             235  
Other             0  
Net income $ 282     282 256     256
Dividend to parent               (79)
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 $ 6,166 $ 0 $ 4,745 $ 1,421