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Stockholders' Equity - Share Repurchase Program (Details) - USD ($) shares in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Feb. 28, 2023
Equity [Abstract]
Share repurchase program, authorized amount			$ 1,000,000,000
Stock repurchased (in shares)	6.4	8.3
Stock repurchased	$ 370,000,000	$ 495,000,000
Stock repurchase remaining amount	$ 505,000,000.0	$ 505,000,000.0

X

- Definition

Stock Repurchased During Period, Value, Net

+ References

No definition available.

+ Details

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Namespace Prefix:	twlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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

X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Topic 946
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Balance Type:	na
Period Type:	duration