Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Treasury Stock	Additional Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive (Loss) Income	Total Alight, Inc. Equity	Noncontrolling Interest
Balance at Dec. 31, 2021	$ 4,928		$ 4,228	$ (96)	$ (8)	$ 4,140	$ 788
Net income (loss)	(13)			(11)		(11)	(2)
Other comprehensive income (loss), net	44				(36)	(36)	8
Measurement period adjustment	(1)						(1)
Conversion of noncontrolling interest	(6)		7			7	(13)
Share-based compensation expense	33		33			33
Shares vested, net of shares withheld in lieu of taxes	(1)		(1)			(1)
Balance at Mar. 31, 2022	4,984		4,267	(107)	44	4,204	780
Balance at Dec. 31, 2022	5,089	$ (12)	4,514	(158)	95	4,439	650
Balance, Shares at Dec. 31, 2022		1,506,385
Net income (loss)	(74)			(68)		(68)	(6)
Other comprehensive income (loss), net	(20)				(14)	(14)	6
Conversion of noncontrolling interest	(49)		145			145	(194)
Share-based compensation expense	37		37			37
Shares vested, net of shares withheld in lieu of taxes	(6)		(6)			(6)
Share repurchases	(10)	$ (10)				(10)
Balance at Mar. 31, 2023	$ 4,967	$ 22	$ 4,690	$ (226)	$ 81	$ 4,523	$ 444