Document and Entity Information - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 14, 2022	Jun. 30, 2021
Document Documentand Entity Information [Abstract]
Entity Registrant Name	ITT INC.
Document Type	10-K
Document Period End Date	Dec. 31, 2021
Entity Tax Identification Number	81-1197930
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 7.8
Common stock, shares outstanding		85.3
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-05672
Trading Symbol	ITT
Title of 12(b) Security	Common Stock, par value $1.00 per share
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Security Exchange Name	NYSE
Entity Address, Address Line One	1133 Westchester Avenue
Entity Address, City or Town	White Plains
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10604
City Area Code	(914)
Local Phone Number	641-2000
Entity Central Index Key	0000216228
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	IN
ICFR Auditor Attestation Flag	true
Auditor Name	Deloitte & Touche LLP
Auditor Location	Stamford, Connecticut
Auditor Firm ID	34