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INCOME TAXES - Schedule of Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance [Roll Forward]
Valuation allowance at January 1	$ 8	$ 8	$ 5
Charged to net income	0	0	3
Valuation allowance at December 31	$ 8	$ 8	$ 8

X

- 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

X

- Definition

Valuation Allowance

+ References

No definition available.

+ Details

Name:	tnet_ValuationAllowanceRollForward
Namespace Prefix:	tnet_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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