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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 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):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
Basic and diluted (net loss) earnings per share: |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |
Net Income (Loss) From Continuing Operations | $ | (1,055) |  |  | $ | (44) |  |  | $ | (2,145) |  |  | $ | (169) |  |  |
Less: Net income (loss) attributable to noncontrolling interest | 1 |  |  | — |  |  | 2 |  |  | 2 |  |  |
Net Income (loss) from continuing operations attributable to Alight, Inc. | $ | (1,054) |  |  | $ | (44) |  |  | $ | (2,143) |  |  | $ | (167) |  |  |
Net Income (Loss) From Discontinued Operations, Net of Tax | (13) |  |  | (30) |  |  | (22) |  |  | 2 |  |  |
Net Income (Loss) Attributable to Alight, Inc. - basic | $ | (1,067) |  |  | $ | (74) |  |  | $ | (2,165) |  |  | $ | (165) |  |  |
Loss impact of conversion of noncontrolling interest | — |  |  | — |  |  | — |  |  | (1) |  |  |
Net income (loss) attributable to Alight, Inc. - diluted | $ | (1,067) |  |  | $ | (74) |  |  | $ | (2,165) |  |  | $ | (166) |  |  |
Denominator |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding - basic | 526,576,757 |  | 535,828,896 |  | 529,206,657 |  | 545,659,335 |  |
Dilutive effect of the exchange of noncontrolling interest units | — |  | — |  | — |  | 560,433 |  |
Dilutive effect of RSUs | — |  | — |  | — |  | — |  |
Weighted-average shares outstanding - diluted | 526,576,757 |  | 535,828,896 |  | 529,206,657 |  | 546,219,768 |  |
Basic and Diluted (net loss) earnings per share |  |  |  |  |  |  |  |  |
Continuing operations | $ | (2.00) |  |  | $ | (0.08) |  |  | $ | (4.05) |  |  | $ | (0.31) |  |  |
Discontinued operations | $ | (0.02) |  |  | $ | (0.06) |  |  | $ | (0.04) |  |  | $ | 0.00 |  |  |
Net Income (Loss) | $ | (2.02) |  |  | $ | (0.14) |  |  | $ | (4.09) |  |  | $ | (0.31) |  |  |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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