Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2023	May 17, 2023	Jun. 30, 2024	May 17, 2023	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 31	$ 419	$ 458	$ 465	$ 777
Other Comprehensive Income (Loss)
Available-for-sale securities unrealized gain (loss), net	(6)	(4)	2	6	1
Income tax benefit (expense)	2	2	(1)	(2)	0
Gains (losses) arising during the period, net of tax	(4)	(2)	1	4	1
Available-for-sale securities unrealized (gain) loss, net	1	(2)	(5)	4	(12)
Qualifying derivatives unrealized (gain) loss, net	0	0	0	(1)	0
Postretirement benefit actuarial (gain) loss, net	0	1	0	2	0
Income tax benefit (expense)	0	0	2	(3)	5
Reclassifications from AOCI, net of tax	1	(1)	(3)	2	(7)
Other comprehensive income (loss)	(3)	(3)	(2)	6	(6)
Comprehensive Income (Loss)	28	416	456	471	771
Less: Comprehensive income (loss) attributable to noncontrolling interest	2	(12)	4	(14)	29
Comprehensive Income (Loss) Attributable to Stockholders (Successor) / Member (Predecessor)	$ 26	$ 428	$ 452	$ 485	$ 742