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 Jun. 30, 2021	$ 4,786		$ 4,009	$ (61)		$ 3,948	$ 838
Net income (loss)	(120)			(107)		(107)	(13)
Other comprehensive income, net	(3)				$ (3)	(3)
Share-based compensation expense	15		15			15
Balance at Sep. 30, 2021	4,678		4,024	(168)	(3)	3,853	825
Balance at Dec. 31, 2021	4,928		4,228	(96)	8	4,140	788
Net income (loss)	(13)			(11)		(11)	(2)
Other comprehensive income, 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, 2021	4,928		4,228	(96)	8	4,140	788
Net income (loss)	(6)
Other comprehensive income, net	94
Balance, Shares at Sep. 30, 2022		1,506,385
Balance at Sep. 30, 2022	5,124	$ (12)	4,366	(93)	87	4,348	776
Balance at Mar. 31, 2022	4,984		4,267	(107)	44	4,204	780
Net income (loss)	52			51		51	1
Other comprehensive income, net	18				17	17	1
Conversion of noncontrolling interest	(1)		2			2	(3)
Share-based compensation expense	42		42			42
Balance at Jun. 30, 2022	5,095		4,311	(56)	61	4,316	779
Net income (loss)	(45)			(37)		(37)	(8)
Other comprehensive income, net	32				26	26	6
Conversion of noncontrolling interest			1			1	(1)
Share-based compensation expense	54		54			54
Share repurchases	(12)	$ (12)				(12)
Balance, Shares at Sep. 30, 2022		1,506,385
Balance at Sep. 30, 2022	$ 5,124	$ (12)	$ 4,366	$ (93)	$ 87	$ 4,348	$ 776