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, 2021	$ 7,483	$ 2	$ 8,546	$ (2,381)	$ 1,316
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(951)			(951)
Net income (loss)	1,643			1,643
Other comprehensive income (loss)	(7,090)				(7,090)
Other	7		13	(6)
Ending balance at Sep. 30, 2022	1,092	2	8,559	(1,695)	(5,774)
Beginning balance at Jun. 30, 2022	4,082	2	8,539	(1,203)	(3,256)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(951)			(951)
Net income (loss)	458			458
Other comprehensive income (loss)	(2,518)				(2,518)
Other	21		20	1
Ending balance at Sep. 30, 2022	1,092	2	8,559	(1,695)	(5,774)
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	(1,653)		(1,653)
Net income (loss)	1,237			1,237
Other comprehensive income (loss)	(682)				(682)
Other	7		7
Ending balance at Sep. 30, 2023	(2,165)	2	6,890	(520)	(8,537)
Beginning balance at Jun. 30, 2023	48	2	7,483	(1,354)	(6,083)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent company	(603)		(603)
Net income (loss)	834			834
Other comprehensive income (loss)	(2,454)				(2,454)
Other	10		10
Ending balance at Sep. 30, 2023	$ (2,165)	$ 2	$ 6,890	$ (520)	$ (8,537)