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INCOME TAXES - Schedule of Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Valuation Allowance [Roll Forward] |  |  |
Valuation allowance at January 1 | $ 8 | $ 5 | $ 5
Charged to net income | 0 | 3 | 0
Valuation allowance at December 31 | $ 8 | $ 8 | $ 5

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- Definition Valuation Allowance, Deferred Tax Asset, Credited To Net Income, Amount + References No definition available. + Details
Name: | tnet_ValuationAllowanceDeferredTaxAssetCreditedToNetIncomeAmount
Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation Allowance + References No definition available. + Details
Name: | tnet_ValuationAllowanceRollForward
Namespace Prefix: | tnet_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant