Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2021	$ 7,483	$ 2	$ 8,546	$ (2,381)	$ 1,316
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(967)			(967)
Net income (loss)	1,594			1,594
Other comprehensive income (loss)	(9,171)				(9,171)
Other	(13)		(10)	(3)
Balance, end of period at Dec. 31, 2022	(1,074)	2	8,536	(1,757)	(7,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(1,657)		(1,657)
Net income (loss)	157			157
Other comprehensive income (loss)	917				917
Other	16		16
Balance, end of period at Dec. 31, 2023	(1,641)	2	6,895	(1,600)	(6,938)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(26)		(26)
Net income (loss)	(214)			(214)
Other comprehensive income (loss)	(946)				(946)
Other	(42)		(42)
Balance, end of period at Dec. 31, 2024	$ (2,869)	$ 2	$ 6,827	$ (1,814)	$ (7,884)