| Cover Page | Jan. 07, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 7, 2020 |
| Entity Registrant Name | Discovery, Inc. |
| Entity File Number | 001-34177 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 35-2333914 |
| Entity Address, Address Line One | 8403 Colesville Road |
| Entity Address, City or Town | Silver Spring |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 20910 |
| City Area Code | 240 |
| Local Phone Number | 662-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001437107 |
| Amendment Flag | false |
| Series A Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Series A Common Stock |
| Trading Symbol | DISCA |
| Security Exchange Name | NASDAQ |
| Series B Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Series B Common Stock |
| Trading Symbol | DISCB |
| Security Exchange Name | NASDAQ |
| Series C Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Series C Common Stock |
| Trading Symbol | DISCK |
| Security Exchange Name | NASDAQ |
