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v3.22.1

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

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- Definition Common Shares Held. + References No definition available. + Details
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Namespace Prefix: | ddl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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