Consolidated Statements of Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings/ Accumulated Deficit	Retained Earnings/ Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period at Dec. 31, 2020	$ 781	$ 58	$ 3	$ 692	$ (50)	$ 1	$ 136	$ 57
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(85)				(85)
Capital contribution from parent	50			50
Other comprehensive income (loss)	(95)						(95)
Dividend of AB Units to parent	(61)			(61)
Other	(1)			(1)
Balance at end of period at Dec. 31, 2021	647		3	680	(134)		98
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(88)				(88)
Capital contribution from parent	150			150
Other comprehensive income (loss)	(479)						(479)
Other	1			1
Balance at end of period at Dec. 31, 2022	231		3	831	(222)		(381)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,191				1,191
Capital contribution from parent	1,050			1,050
Other comprehensive income (loss)	(313)						(313)
Other	1			1
Balance at end of period at Dec. 31, 2023	$ 2,160		$ 3	$ 1,882	$ 969		$ (694)