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Stockholders' Equity - Additional Disclosures for Equity-Based Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
RSUs |  |  |
Additional Disclosures for equity-based plans |  |  |
Total grant date fair value of shares granted (in millions) | $ 34 | $ 46 | $ 42
Total grant date fair value of shares vested (in millions) | $ 35 | $ 21 | $ 16
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees | 451,875 | 335,101 | 217,769
RSAs |  |  |
Additional Disclosures for equity-based plans |  |  |
Total grant date fair value of shares granted (in millions) | $ 18 | $ 0 | $ 0
Total grant date fair value of shares vested (in millions) | $ 1 | $ 0 | $ 0
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees | 6,357 | 0 | 0

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value. + References No definition available. + Details
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Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Details
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- Details
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