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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             650  
Net income $ 325     325 $ 108     108
Dividend to parent               (51)
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 5,705 $ 0 4,510 1,195
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             230  
Net income $ 350     350 99     99
Dividend to parent               (36)
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 $ 6,402 $ 0 $ 4,975 $ 1,427