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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

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