Restructuring and Integration - Schedule of Accrued Restructuring Liability (Details) - USD ($)
$ in Millions |
6 Months Ended |
12 Months Ended |
Dec. 31, 2021 |
Jun. 30, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Restructuring Cost And Reserve [Line Items] |
|
|
|
|
| Accrued restructuring liability, Beginning balance |
$ 6
|
|
|
|
| Restructuring charges |
5
|
$ 9
|
$ 77
|
$ 14
|
| Cash payments |
(7)
|
|
|
|
| Accrued restructuring liability, Ending Balance |
4
|
6
|
|
|
| Alight Holdings |
|
|
|
|
| Restructuring Cost And Reserve [Line Items] |
|
|
|
|
| Accrued restructuring liability, Beginning balance |
6
|
15
|
|
|
| Restructuring charges |
|
9
|
|
|
| Cash payments |
|
(18)
|
|
|
| Accrued restructuring liability, Ending Balance |
|
6
|
15
|
|
| Severance and Related Benefits |
|
|
|
|
| Restructuring Cost And Reserve [Line Items] |
|
|
|
|
| Accrued restructuring liability, Beginning balance |
6
|
|
|
|
| Restructuring charges |
1
|
|
|
|
| Cash payments |
(3)
|
|
|
|
| Accrued restructuring liability, Ending Balance |
4
|
6
|
|
|
| Severance and Related Benefits | Alight Holdings |
|
|
|
|
| Restructuring Cost And Reserve [Line Items] |
|
|
|
|
| Accrued restructuring liability, Beginning balance |
6
|
12
|
|
|
| Restructuring charges |
|
7
|
|
|
| Cash payments |
|
(13)
|
|
|
| Accrued restructuring liability, Ending Balance |
|
6
|
12
|
|
| Other Restructuring Costs |
|
|
|
|
| Restructuring Cost And Reserve [Line Items] |
|
|
|
|
| Restructuring charges |
4
|
|
|
|
| Cash payments |
$ (4)
|
|
|
|
| Other Restructuring Costs | Alight Holdings |
|
|
|
|
| Restructuring Cost And Reserve [Line Items] |
|
|
|
|
| Accrued restructuring liability, Beginning balance |
|
3
|
|
|
| Restructuring charges |
|
2
|
|
|
| Cash payments |
|
$ (5)
|
|
|
| Accrued restructuring liability, Ending Balance |
|
|
$ 3
|
|