Stockholders' Equity - Changes in AOCI (Details) - USD ($) $ 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
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 2,431	$ 2,431		$ 2,766	$ 2,534			$ 2,534
Other comprehensive income (loss)	(3)	(3)	$ (3)	(2)	(4)	$ 9	$ 6	(6)
Ending balance	2,460	2,460	2,431	2,572	2,766		2,431	2,572
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0	0		(27)	(23)	$ (167)	(167)	(23)
Gains (losses) arising during the period	(6)						6	1
Reclassification to Consolidated Statements of Operations	1						5	(12)
Income tax benefit (expense)	2						(5)	5
Other comprehensive income (loss)	(3)	(3)		(2)	(4)		6	(6)
Ending balance	$ (3)	$ (3)	$ 0	$ (29)	$ (27)		$ 0	$ (29)