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INCOME TAXES - Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance [Roll Forward]
Valuation allowance at January 1	$ 5	$ 5	$ 5
Charged to net income	3	0	0
Valuation allowance at December 31	$ 8	$ 5	$ 5

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant