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Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2024
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:
| Nine Months Ended September 30,
(in millions) | 2024 |  | 2023
Beginning balance, January 1, | $ | 220 |  |  | $ | 229 |
Accrued claims | 48 |  |  | 44 |
Present value discount, net of accretion | (10) |  |  | (10) |
Paid claims | (51) |  |  | (41) |
Ending balance | $ | 207 |  |  | $ | 222 |
Current portion of accrued claims | $ | 67 |  |  | $ | 51 |
Long-term portion of accrued claims | 140 |  |  | 171 |
Total accrued claims | $ | 207 |  |  | $ | 222 |
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 September 30, |  | Nine Months Ended September 30,
(in millions) | 2024 | 2023 | % Change |  | 2024 | 2023 | % Change
Northeast | $ | 419 |  | $ | 415 |  | 1 | % |  | $ | 1,365 |  | $ | 1,333 |  | 2 | %
Southeast | 223 |  | 222 |  | — |  |  | 694 |  | 682 |  | 2 | %
Central | 286 |  | 282 |  | 1 | % |  | 902 |  | 886 |  | 2 | %
Southwest | 294 |  | 295 |  | — |  |  | 938 |  | 943 |  | (1) | %
West | 321 |  | 321 |  | — |  |  | 1,016 |  | 1,014 |  | — |
| 1,543 |  | 1,535 |  | 1 | % |  | 4,915 |  | 4,858 |  | 1 | %
Other revenue | 18 |  | 16 |  | 13 | % |  | 53 |  | 48 |  | 10 | %
Total revenue | $ | 1,561 |  | $ | 1,551 |  | 1 | % |  | $ | 4,968 |  | $ | 4,906 |  | 1 | %
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 September 30, | Nine Months Ended September 30,
(in millions) | 2024 | 2023 | 2024 | 2023
Gross billings | $ | 10,291 |  | $ | 10,067 |  | $ | 32,135 |  | $ | 31,763 |
Less: WSEE payroll cost | 8,730 |  | 8,516 |  | 27,167 |  | 26,857 |
Revenues | $ | 1,561 |  | $ | 1,551 |  | $ | 4,968 |  | $ | 4,906 |

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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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