Share-Based Compensation Expense - Schedule of Share-Based Compensation Costs Related to RSUs and PRSUs (Details) - RSUs and PRSUs[Member] - USD ($)
$ in Millions |
6 Months Ended |
12 Months Ended |
Dec. 31, 2021 |
Jun. 30, 2021 |
Dec. 31, 2022 |
Dec. 31, 2020 |
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
|
|
|
|
| Total Share-based compensation expense |
$ 67
|
|
$ 181
|
|
| Alight Holdings |
|
|
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
|
|
|
|
| Total Share-based compensation expense |
|
$ 5
|
|
$ 5
|
| Cost of services [Member] |
|
|
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
|
|
|
|
| Total Share-based compensation expense |
19
|
|
40
|
|
| Cost of services [Member] | Alight Holdings |
|
|
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
|
|
|
|
| Total Share-based compensation expense |
|
1
|
|
1
|
| Selling, general and administrative expenses [Member] |
|
|
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
|
|
|
|
| Total Share-based compensation expense |
$ 48
|
|
$ 141
|
|
| Selling, general and administrative expenses [Member] | Alight Holdings |
|
|
|
|
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
|
|
|
|
| Total Share-based compensation expense |
|
$ 4
|
|
$ 4
|