CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings
Balance (in shares) at Dec. 31, 2022		933,000
Beginning Balance at Dec. 31, 2022	$ 1,259	$ 93	$ 761	$ 405
Increase (Decrease) in Stockholder's Equity
Net income	45			45
Common dividends declared to parent	(24)			(24)
Contribution of capital by parent	30		30
Balance (in shares) at Mar. 31, 2023		933,000
Ending Balance at Mar. 31, 2023	$ 1,310	$ 93	791	426
Balance (in shares) at Dec. 31, 2023	933,000	933,000
Beginning Balance at Dec. 31, 2023	$ 1,366	$ 93	843	430
Increase (Decrease) in Stockholder's Equity
Net income	43			43
Common dividends declared to parent	(18)			(18)
Contribution of capital by parent	$ 95		95
Balance (in shares) at Mar. 31, 2024	933,000	933,000
Ending Balance at Mar. 31, 2024	$ 1,486	$ 93	$ 938	$ 455