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Business Combination (Details) - Silversea Cruises |  | 1 Months Ended
--- | --- | ---
Jul. 31, 2018 USD ($) ship | Jul. 31, 2018 USD ($) ship shares
Business Acquisition [Line Items] |  |
Percentage of interests acquired | 66.70% | 66.70%
Number of cruise ships acquired | ship | 9 | 9
Payments to acquire business | $ 1,020,000,000 |
Contingent consideration | 44,000,000 | $ 44,000,000
Silversea Cruises |  |
Business Acquisition [Line Items] |  |
Long-term debt | $ 700,000,000 | $ 700,000,000
Minimum |  |
Business Acquisition [Line Items] |  |
Contingent consideration, shares (in shares) | shares |  | 0
Maximum |  |
Business Acquisition [Line Items] |  |
Contingent consideration, shares (in shares) | shares |  | 472,000

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