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Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2025
Accounting Policies [Abstract] |
Activity and balances related to incurred but not paid workers' compensation claims | The following table provides the activity and balances related to incurred but not paid workers’ compensation claims:
| Three Months Ended March 31,
(in millions) | 2025 |  | 2024
Beginning balance, January 1, | $ | 204 |  |  | $ | 220 |
Accrued claims, net | 16 |  |  | 14 |
Present value discount, net of accretion | (3) |  |  | (3) |
Paid claims | (21) |  |  | (16) |
Ending balance | $ | 196 |  |  | $ | 215 |
Current portion of accrued claims | $ | 74 |  |  | $ | 60 |
Long-term portion of accrued claims | 122 |  |  | 155 |
Total accrued claims | $ | 196 |  |  | $ | 215 |
Disaggregation of Revenue [Table Text Block] | Our revenue for our PEO HR Outsourcing Solutions by geographic region and for our other products and services offerings are as follows:
| Three Months Ended March 31,
(in millions) | 2025 | 2024 | % Change
Northeast | $ | 526 |  | $ | 509 |  | 3 | %
Southeast | 257 |  | 246 |  | 4 | %
Central | 335 |  | 324 |  | 3 | %
Southwest | 347 |  | 340 |  | 2 | %
West | 377 |  | 366 |  | 3 | %
| 1,842 |  | 1,785 |  | 3 | %
Other revenue | 21 |  | 17 |  | 24 | %
Total revenue | $ | 1,863 |  | $ | 1,802 |  | 3 | %
Revenues Comprise of Gross Billings and WSEE Payroll Cost [Table] | Revenues are comprised of gross billings less WSEE payroll costs as follows:
| Three Months Ended March 31,
(in millions) | 2025 | 2024
Gross billings | $ | 12,144 |  | $ | 11,483 |
Less: WSEE payroll cost | 10,281 |  | 9,681 |
Revenues | $ | 1,863 |  | $ | 1,802 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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