Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2022	$ (1,074)	$ 2	$ 8,536	$ (1,757)	$ (7,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(1,050)		(1,050)
Net income (loss)	403			403
Other comprehensive income (loss)	1,772				1,772
Other	(3)		(3)
Ending balance at Jun. 30, 2023	48	2	7,483	(1,354)	(6,083)
Beginning balance at Mar. 31, 2023	1,228	2	8,524	(1,776)	(5,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(1,050)		(1,050)
Net income (loss)	422			422
Other comprehensive income (loss)	(561)				(561)
Other	9		9	0
Ending balance at Jun. 30, 2023	48	2	7,483	(1,354)	(6,083)
Beginning balance at Dec. 31, 2023	(1,641)	2	6,895	(1,600)	(6,938)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(4)		(4)
Net income (loss)	(4)			(4)
Other comprehensive income (loss)	(804)				(804)
Other	2		2
Ending balance at Jun. 30, 2024	(2,451)	2	6,893	(1,604)	(7,742)
Beginning balance at Mar. 31, 2024	(2,039)	2	6,884	(1,653)	(7,272)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	49			49
Other comprehensive income (loss)	(470)				(470)
Other	9		9
Ending balance at Jun. 30, 2024	$ (2,451)	$ 2	$ 6,893	$ (1,604)	$ (7,742)