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	302			302
Dividends declared to parent	(238)			(238)
Ending balance (in shares) at Sep. 30, 2023		100
Ending balance at Sep. 30, 2023	3,961	$ 0	3,358	604	(1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	47		47
Beginning balance (in shares) at Jun. 30, 2023		100
Beginning balance at Jun. 30, 2023	3,825	$ 0	3,319	507	(1)
Increase (Decrease) in Stockholders' Equity
Net income	167			167
Dividends declared to parent	(70)			(70)
Ending balance (in shares) at Sep. 30, 2023		100
Ending balance at Sep. 30, 2023	3,961	$ 0	3,358	604	(1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	$ 39		39
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	322			322
Dividends declared to parent	$ (318)			(318)
Ending balance (in shares) at Sep. 30, 2024	100	100
Ending balance at Sep. 30, 2024	$ 4,257	$ 0	3,637	621	(1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	267		267
Beginning balance (in shares) at Jun. 30, 2024		100
Beginning balance at Jun. 30, 2024	4,260	$ 0	3,633	628	(1)
Increase (Decrease) in Stockholders' Equity
Net income	176			176
Dividends declared to parent	$ (183)			(183)
Ending balance (in shares) at Sep. 30, 2024	100	100
Ending balance at Sep. 30, 2024	$ 4,257	$ 0	3,637	$ 621	$ (1)
Increase (Decrease) in Stockholders' Equity
Contributions of capital by parent	$ 4		$ 4