CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2023		100
Beginning balance at Dec. 31, 2023	$ 3,986	$ 0	$ 3,370	$ 617	$ (1)
Increase (Decrease) in Stockholders' Equity
Net income	57			57
Dividends declared to parent	(89)			(89)
Ending balance (in shares) at Mar. 31, 2024		100
Ending balance at Mar. 31, 2024	$ 3,954	$ 0	3,370	585	(1)
Beginning balance (in shares) at Dec. 31, 2024	100	100
Beginning balance at Dec. 31, 2024	$ 4,238	$ 0	3,647	592	(1)
Increase (Decrease) in Stockholders' Equity
Net income	59			59
Dividends declared to parent	$ (53)			(53)
Ending balance (in shares) at Mar. 31, 2025	100	100
Ending balance at Mar. 31, 2025	$ 4,444	$ 0	3,847	$ 598	$ (1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	$ 200		$ 200