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Restructuring and Integration - Summary of Restructuring Costs (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($)
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | $ 26 |
Inception to Date | 26 |
Estimated Remaining Costs | 114 |
Estimated Total Cost | 140 |
Employer Solutions |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 20 |
Inception to Date | 20 |
Estimated Remaining Costs | 95 |
Estimated Total Cost | 115 |
Employer Solutions | Severance and Related Benefits |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 1 |
Inception to Date | 1 |
Estimated Remaining Costs | 15 |
Estimated Total Cost | 16 |
Employer Solutions | Other Restructuring Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 19 | [1]
Inception to Date | 19 | [1]
Estimated Remaining Costs | 80 | [1]
Estimated Total Cost | 99 | [1]
Professional Services |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  |
Inception to Date |  |
Estimated Remaining Costs | 9 |
Estimated Total Cost | 9 |
Professional Services | Severance and Related Benefits |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs |  |
Inception to Date |  |
Estimated Remaining Costs | 5 |
Estimated Total Cost | 5 |
Professional Services | Other Restructuring Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Estimated Remaining Costs | 4 | [1]
Estimated Total Cost | 4 | [1]
Corporate |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 6 |
Inception to Date | 6 |
Estimated Remaining Costs | 10 |
Estimated Total Cost | 16 |
Corporate | Severance and Related Benefits |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 5 |
Inception to Date | 5 |
Estimated Remaining Costs | 8 |
Estimated Total Cost | 13 |
Corporate | Other Restructuring Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring Costs | 1 | [1]
Inception to Date | 1 | [1]
Estimated Remaining Costs | 2 | [1]
Estimated Total Cost | $ 3 | [1]
[1] | Other restructuring costs associated with the Transformation Program primarily include data center exit costs, third party fees associated with the restructuring, and costs associated with transitioning existing technology and processes.

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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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