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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 14, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37806    
Entity Registrant Name TWILIO INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-2574840    
Entity Address, Address Line One 101 Spear Street    
Entity Address, Address Line Two Fifth Floor    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94105    
City Area Code 415    
Local Phone Number 390-2337    
Title of 12(b) Security Class A Common Stock, par value $0.001 per share    
Trading Symbol TWLO    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 9.1
Entity Common Stock, Shares Outstanding (in shares)   152,633,605  
Documents Incorporated by Reference Portions of the registrant's definitive Proxy Statement for the 2025 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 202    
Entity Central Index Key 0001447669    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY