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	146			146
Dividends declared to parent	(135)			(135)
Contributions of capital by parent	263		263
Ending balance (in shares) at Jun. 30, 2024		100
Ending balance at Jun. 30, 2024	4,260	$ 0	3,633	628	(1)
Beginning balance (in shares) at Mar. 31, 2024		100
Beginning balance at Mar. 31, 2024	3,954	$ 0	3,370	585	(1)
Increase (Decrease) in Stockholders' Equity
Net income	89			89
Dividends declared to parent	(46)			(46)
Contributions of capital by parent	263		263
Ending balance (in shares) at Jun. 30, 2024		100
Ending balance at Jun. 30, 2024	$ 4,260	$ 0	3,633	628	(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	160			160
Dividends declared to parent	(105)			(105)
Contributions of capital by parent	$ 553		553
Ending balance (in shares) at Jun. 30, 2025	100	100
Ending balance at Jun. 30, 2025	$ 4,846	$ 0	4,200	647	(1)
Beginning balance (in shares) at Mar. 31, 2025		100
Beginning balance at Mar. 31, 2025	4,444	$ 0	3,847	598	(1)
Increase (Decrease) in Stockholders' Equity
Net income	101			101
Dividends declared to parent	(52)			(52)
Contributions of capital by parent	$ 353		353
Ending balance (in shares) at Jun. 30, 2025	100	100
Ending balance at Jun. 30, 2025	$ 4,846	$ 0	$ 4,200	$ 647	$ (1)