v3.10.0.1
Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Nov. 30, 2018
Dec. 31, 2018
May 31, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name IHS Markit Ltd.    
Entity Central Index Key 0001598014    
Current Fiscal Year End Date --11-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Nov. 30, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   397,359,890  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 13.4