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Subsequent Events (Details) - Subsequent Event - ATM Offering shares in Millions | Sep. 15, 2020 USD ($) shares
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Subsequent Event [Line Items] |
Stock value, authorized | $ 1,000,000,000.0
Shares issued (in shares) | shares | 23
Consideration received | $ 352,000,000
Issuance costs | $ 4,000,000

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- Definition Common Stock, Value, Authorized + References No definition available. + Details
Name: | ccl_CommonStockValueAuthorized
Namespace Prefix: | ccl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sale of Stock, Issuance Costs + References No definition available. + Details
Name: | ccl_SaleOfStockIssuanceCosts
Namespace Prefix: | ccl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=ccl_ATMOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |