CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2022		100
Beginning Balance at Dec. 31, 2022	$ 9,230	$ 0	$ 6,992	$ 2,260	$ (22)
Increase (Decrease) in Stockholder's Equity
Net income	214			214
Total other comprehensive income	1				1
Dividends declared to parent	(183)			(183)
Contribution of capital by parent	65		65
Balance (in shares) at Mar. 31, 2023		100
Ending Balance at Mar. 31, 2023	$ 9,327	$ 0	7,057	2,291	(21)
Balance (in shares) at Dec. 31, 2023	100	100
Beginning Balance at Dec. 31, 2023	$ 9,742	$ 0	7,412	2,350	(20)
Increase (Decrease) in Stockholder's Equity
Net income	219			219
Total other comprehensive income	0
Dividends declared to parent	(164)			(164)
Contribution of capital by parent	$ 50		50
Balance (in shares) at Mar. 31, 2024	100	100
Ending Balance at Mar. 31, 2024	$ 9,847	$ 0	$ 7,462	$ 2,405	$ (20)