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INCOME TAXES - Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Valuation allowance at January 1 | $ 5 | $ 7 | $ 7
Credited/ charged to net income | 0 | (2) | 0
Valuation allowance at December 31 | $ 5 | $ 5 | $ 7

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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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