| Document and Entity Information | Aug. 09, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000949039 |
| Document Type | 8-K |
| Document Period End Date | Aug. 09, 2022 |
| Entity Registrant Name | Diamond Offshore Drilling, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-13926 |
| Entity Tax Identification Number | 76-0321760 |
| Entity Address, Address Line One | 15415 Katy Freeway |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77094 |
| City Area Code | (281) |
| Local Phone Number | 492-5300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.0001 par value per share |
| Trading Symbol | DO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
