Description of Business (Details)	Sep. 30, 2022 jurisdiction
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of jurisdictions with legalized sports betting in which company operates	18

Number Of Jurisdictions With Legalized Sports Betting In Which Company Operates

No definition available.

Name:	dkng_NumberOfJurisdictionsWithLegalizedSportsBettingInWhichCompanyOperates
Namespace Prefix:	dkng_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant