CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings
Beginning Balance at Dec. 31, 2020	$ 1,068	$ 93	$ 605	$ 370
Balance (in shares) at Dec. 31, 2020		933,000
Increase (Decrease) in Stockholder's Equity
Net income	108			108
Dividends, Common Stock, Cash	(110)			(110)
Contribution of capital by parent	37		37
Ending Balance at Dec. 31, 2021	1,103	$ 93	642	368
Balance (in shares) at Dec. 31, 2021		933,000
Increase (Decrease) in Stockholder's Equity
Net income	125			125
Dividends, Common Stock, Cash	(88)			(88)
Contribution of capital by parent	119		119
Ending Balance at Dec. 31, 2022	$ 1,259	$ 93	761	405
Balance (in shares) at Dec. 31, 2022	933,000	933,000
Increase (Decrease) in Stockholder's Equity
Net income	$ 136			136
Dividends, Common Stock, Cash	(111)			(111)
Contribution of capital by parent	82		82
Ending Balance at Dec. 31, 2023	$ 1,366	$ 93	$ 843	$ 430
Balance (in shares) at Dec. 31, 2023	933,000	933,000