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, 2022		100
Beginning balance at Dec. 31, 2022	$ 3,850	$ 0	$ 3,311	$ 540	$ (1)
Increase (Decrease) in Stockholders' Equity
Net income	135			135
Dividends declared to parent	(168)			(168)
Ending balance (in shares) at Jun. 30, 2023		100
Ending balance at Jun. 30, 2023	3,825	$ 0	3,319	507	(1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	8		8
Beginning balance (in shares) at Mar. 31, 2023		100
Beginning balance at Mar. 31, 2023	3,838	$ 0	3,311	528	(1)
Increase (Decrease) in Stockholders' Equity
Net income	81			81
Dividends declared to parent	(102)			(102)
Ending balance (in shares) at Jun. 30, 2023		100
Ending balance at Jun. 30, 2023	3,825	$ 0	3,319	507	(1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	$ 8		8
Beginning balance (in shares) at Dec. 31, 2023	100	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)
Ending balance (in shares) at Jun. 30, 2024	100	100
Ending balance at Jun. 30, 2024	$ 4,260	$ 0	3,633	628	(1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	263		263
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)
Ending balance (in shares) at Jun. 30, 2024	100	100
Ending balance at Jun. 30, 2024	$ 4,260	$ 0	3,633	$ 628	$ (1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	$ 263		$ 263