STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY - 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 year (in shares) at Dec. 31, 2018		501,000,000					1,000
Balance, end of year (in shares) at Dec. 31, 2019		502,000,000					1,000
Balance, beginning of year at Dec. 31, 2018		$ 5	$ 6,072	$ 349	$ (108)		$ 0	$ 1,896	$ 800	$ (14)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash contribution from parent								590
Other								0
Net income (loss)	$ 791			791		$ 356			356
Dividend to parent									(376)
Other comprehensive income					10					(1)
Balance, end of year at Dec. 31, 2019	$ 8,359	$ 5	6,080	632	(98)	3,251	$ 0	2,486	780	(15)
Balance, end of year (in shares) at Dec. 31, 2020	551,355,861	551,000,000					1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash contribution from parent								62
Other								0
Net income (loss)	$ (773)			(773)		334			334
Dividend to parent									(551)
Other comprehensive income					8					15
Balance, end of year at Dec. 31, 2020	$ 8,348	$ 6	6,914	(845)	(90)	3,111	$ 0	2,548	563	0
Balance, end of year (in shares) at Dec. 31, 2021	628,923,534	629,000,000					1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash contribution from parent								130
Other								0
Net income (loss)	$ 1,486			1,486		381			381
Dividend to parent									0
Other comprehensive income					26					0
Balance, end of year at Dec. 31, 2021	$ 9,415	$ 6	$ 8,529	$ 154	$ (64)	$ 3,622	$ 0	$ 2,678	$ 944	$ 0