Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Summary of Basic and Diluted (Net Loss) Earnings Per Share

Basic and diluted (net loss) earnings per share are as follows (in millions, except for share and per share amounts):

	Year Ended December 31,
	2025		2024		2023
Basic and diluted (net loss) earnings per share:
Numerator
Net Income (Loss) From Continuing Operations	$	(3,078)	$	(140)	$	(317)
Less: Net income (loss) attributable to noncontrolling interest	2		2		17
Net Income (loss) from continuing operations attributable to Alight, Inc.	$	(3,076)	$	(138)	$	(300)
Net Income (Loss) From Discontinued Operations, Net of Tax	(21)		(19)		(45)
Net Income (Loss) Attributable to Alight, Inc. - basic	$	(3,097)	$	(157)	$	(345)
Loss impact of conversion of noncontrolling interest	—		(1)		—
Net income (loss) attributable to Alight, Inc. - diluted	$	(3,097)	$	(158)	$	(345)
Denominator
Weighted-average shares outstanding - basic	527,567,685		539,861,208		489,461,259
Dilutive effect of the exchange of noncontrolling interest units	—		510,237		—
Dilutive effect of RSUs	—		—		—
Weighted-average shares outstanding - diluted	527,567,685		540,371,445		489,461,259
Basic and Diluted (net loss) earnings per share
Continuing operations	$	(5.83)	$	(0.25)	$	(0.61)
Discontinued operations	$	(0.04)	$	(0.04)	$	(0.09)
Net Income (Loss)	$	(5.87)	$	(0.29)	$	(0.70)