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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, 2022   630,000,000       1,000    
Balance, beginning of period at Dec. 31, 2022   $ 6 $ 8,568 $ 709   $ 0 $ 3,860 $ 1,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Contribution from parent             885  
Net income $ 725     725 $ 522     522
Dividend to parent               (239)
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 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]                
Contribution from parent             235  
Net income 282     282 256     256
Dividend to parent               (79)
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 6,166 $ 0 4,745 1,421
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 6,109 $ 0 4,745 1,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Contribution from parent             324  
Net income $ 771     771 465     465
Dividend to parent               (249)
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 6,649 $ 0 5,069 1,580
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   $ 0 4,975 1,495
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Contribution from parent             94  
Net income $ 193     193 179     179
Dividend to parent               (94)
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 $ 6,649 $ 0 $ 5,069 $ 1,580