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Accrued Workers' Compensation Costs - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Insurance [Abstract] |  |
Collateral held by insurance carriers | $ 44 | $ 45
Liability for unpaid claims and claims adjustment expense, collateral | $ 8 | $ 8

X
- Definition Collateral Held by Insurance Carriers + References No definition available. + Details
Name: | tnet_CollateralHeldByInsuranceCarriers
Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Collateral + References No definition available. + Details
Name: | tnet_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseCollateral
Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration