UNAUDITED INTERIM CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common   Stock	Additional   Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive   Income
Beginning Balance at Dec. 31, 2021	$ 1,682	$ 3	$ 592	$ 917	$ 170
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return of capital	(306)		(306)
Comprehensive income (loss):
Net income (loss)	356			356
Other comprehensive income (loss), net of taxes	(443)				(443)
Total comprehensive income (loss)	(87)
Ending Balance at Mar. 31, 2022	1,289	3	286	1,273	(273)
Comprehensive income (loss):
Net income (loss)	(337)
Other comprehensive income (loss), net of taxes	311
Ending Balance at Sep. 30, 2022	1,736	3	1,759	(337)	311
Beginning Balance at Apr. 01, 2022	1,762	3	1,759	0	0
Comprehensive income (loss):
Net income (loss)	(180)			(180)
Other comprehensive income (loss), net of taxes	194				194
Total comprehensive income (loss)	14
Ending Balance at Jun. 30, 2022	1,776	3	1,759	(180)	194
Comprehensive income (loss):
Net income (loss)	(157)			(157)
Other comprehensive income (loss), net of taxes	117				117
Total comprehensive income (loss)	(40)
Ending Balance at Sep. 30, 2022	1,736	3	1,759	(337)	311
Beginning Balance at Dec. 31, 2022	1,587	3	1,759	(286)	111
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distribution to parent	(45)		(45)
Comprehensive income (loss):
Net income (loss)	7			7
Other comprehensive income (loss), net of taxes	17				17
Total comprehensive income (loss)	24
Ending Balance at Mar. 31, 2023	1,566	3	1,714	(279)	128
Beginning Balance at Dec. 31, 2022	1,587	3	1,759	(286)	111
Comprehensive income (loss):
Net income (loss)	(57)
Other comprehensive income (loss), net of taxes	(109)
Ending Balance at Sep. 30, 2023	1,376	3	1,714	(343)	2
Beginning Balance at Mar. 31, 2023	1,566	3	1,714	(279)	128
Comprehensive income (loss):
Net income (loss)	130			130
Other comprehensive income (loss), net of taxes	(90)				(90)
Total comprehensive income (loss)	40
Ending Balance at Jun. 30, 2023	1,606	3	1,714	(149)	38
Comprehensive income (loss):
Net income (loss)	(194)			(194)
Other comprehensive income (loss), net of taxes	(36)				(36)
Total comprehensive income (loss)	(230)
Ending Balance at Sep. 30, 2023	$ 1,376	$ 3	$ 1,714	$ (343)	$ 2