v3.19.1
Document And Entity Information - shares
3 Months Ended
Mar. 31, 2019
Apr. 22, 2019
Entity Information [Line Items]    
Entity Registrant Name Discovery, Inc.  
Entity Central Index Key 0001437107  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Series A Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares)   157,848,790
Series B Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares)   6,512,378
Series C Common Stock    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares)   360,553,643