XML 28 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Document And Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 01, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 0-15386    
Entity Registrant Name CERNER CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 2800 Rockcreek Parkway    
Entity Address, City or Town North Kansas City,    
Entity Address, State or Province MO    
Entity Tax Identification Number 43-1196944    
Entity Address, Postal Zip Code 64117    
City Area Code 816    
Local Phone Number 221-1024    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol CERN    
Security Exchange Name NASDAQ    
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    
Entity Shell Company false    
Entity Public Float     $ 18.6
Entity Common Stock, Shares Outstanding   306,294,309  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Document  Parts into Which Incorporated
Portions of the registrant's Proxy Statement for the 2021 Annual Shareholders' Meeting  Part III
    
Entity Central Index Key 0000804753    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31