Condensed Statements of Consolidated Changes in Equity (Unaudited) - Houston Electric - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Houston Electric	Houston Electric Common Stock	Houston Electric Additional Paid-in-Capital	Houston Electric Retained Earnings (Accumulated Deficit)	Houston Electric Accumulated Other Comprehensive Loss
Balance, beginning of period (in shares) at Dec. 31, 2020		551,000,000					1,000
Balance, beginning of period at Dec. 31, 2020		$ 6	$ 6,914	$ (845)	$ (90)		$ 0	$ 2,548	$ 563	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash contribution from parent						$ 0		0
Contribution from parent								0
Other								0
Net income	$ 832			832		307			307
Dividend to parent									0
Balance, end of period (in shares) at Sep. 30, 2021		629,000,000					1,000
Balance, end of period at Sep. 30, 2021	8,865	$ 6	8,517	(368)	(80)	3,418	$ 0	2,548	870	0
Balance, beginning of period (in shares) at Jun. 30, 2021		593,000,000					1,000
Balance, beginning of period at Jun. 30, 2021		$ 6	7,553	(343)	(85)		$ 0	2,548	719	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash contribution from parent						0		0
Contribution from parent								0
Other								0
Net income	218			218		151			151
Dividend to parent									0
Balance, end of period (in shares) at Sep. 30, 2021		629,000,000					1,000
Balance, end of period at Sep. 30, 2021	$ 8,865	$ 6	8,517	(368)	(80)	3,418	$ 0	2,548	870	0
Balance, beginning of period (in shares) at Dec. 31, 2021	628,923,534	629,000,000					1,000
Balance, beginning of period at Dec. 31, 2021	$ 9,415	$ 6	8,529	154	(64)	3,622	$ 0	2,678	944	0
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	629,532,024	629,000,000					1,000
Balance, end of period at Sep. 30, 2022	$ 9,989	$ 6	8,557	719	(83)	5,071	$ 0	3,860	1,211	0
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	(85)		$ 0	3,860	1,085	0
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	629,532,024	629,000,000					1,000
Balance, end of period at Sep. 30, 2022	$ 9,989	$ 6	$ 8,557	$ 719	$ (83)	$ 5,071	$ 0	$ 3,860	$ 1,211	$ 0