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Stock-Based Compensation - Narrative (Details)	3 Months Ended
	Mar. 31, 2023
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock plan offering period	6 months

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Stock Plan Offering Period

+ References

No definition available.

+ Details

Name:	twlo_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockPlanOfferingPeriod
Namespace Prefix:	twlo_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: