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Consolidated Statements Of Changes In Shareholders' Deficit (Parentheticals) - shares	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Shares Held	29,633,200
EatBetter Holding Limited [Member]
Common Shares Held	29,633,200	0	0

X

- Definition

Common Shares Held.

+ References

No definition available.

+ Details

Name:	ddl_CommonSharesHeld
Namespace Prefix:	ddl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=ddl_EatbetterHoldingLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: