Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings/ Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Dec. 31, 2022	$ 231	$ 3	$ 831	$ (222)	$ (381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	62			62
Other comprehensive income (loss)	79				79
Balance at end of period at Mar. 31, 2023	372	3	831	(160)	(302)
Balance at beginning of period at Dec. 31, 2022	231	3	831	(222)	(381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	113			113
Other comprehensive income (loss)					36
Balance at end of period at Jun. 30, 2023	1,431			(109)	(345)
Balance at beginning of period at Dec. 31, 2022	231	3	831	(222)	(381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	594			594
Other comprehensive income (loss)	(368)				(368)
Balance at end of period at Sep. 30, 2023	1,506			371	(750)
Balance at beginning of period at Mar. 31, 2023	372	3	831	(160)	(302)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	51			51
Other comprehensive income (loss)					(43)
Balance at end of period at Jun. 30, 2023	1,431			(109)	(345)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	481			481
Other comprehensive income (loss)	(404)				(404)
Balance at end of period at Sep. 30, 2023	1,506			371	(750)
Balance at beginning of period at Dec. 31, 2023	2,160	3	1,882	969	(694)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(83)			(83)
Other comprehensive income (loss)	(5)				(5)
Other	2		2
Balance at end of period at Mar. 31, 2024	$ 2,074	$ 3	$ 1,884	$ 886	$ (699)