Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended		2 Months Ended	3 Months Ended			5 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	May 17, 2023	Jun. 30, 2024	Mar. 31, 2024	Mar. 31, 2023	May 17, 2023	Jun. 30, 2024
Numerator: (Millions of Dollars)
Net Income (Loss)	$ 31	$ 31	$ 419	$ 458	$ 319	$ 46	$ 465	$ 777
Less:
Net income (loss) attributable to noncontrolling interest		2	(12)	4			(14)	29
Net Income (Loss) Attributable to Stockholders (Successor) / Member (Predecessor)		$ 29	$ 431	$ 454			$ 479	$ 748
Denominator: (Thousands)
Weighted-average shares outstanding - Basic (in shares)		59,029	0	57,434			0	58,119
Warrants (in shares)		32	0	268			0	234
Weighted-average shares outstanding - Diluted (in shares)		59,088	0	59,775			0	60,269
Earnings per Share - Basic (in dollars per share)		$ 0.49		$ 7.90				$ 12.87
Earnings per Share - Diluted (in dollars per share)		$ 0.49		$ 7.60				$ 12.41
Restricted stock units
Denominator: (Thousands)
Stock units (in shares)		28	0	332			0	262
Performance stock units
Denominator: (Thousands)
Stock units (in shares)		0	0	1,741			0	1,654