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General - Narrative (Details) $ in Millions | Jul. 31, 2018 USD ($) ship continent | Sep. 30, 2018 brand
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Number of cruise brands | brand |  | 4
Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in a joint venture, percentage of interest |  | 50.00%
Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in a joint venture, percentage of interest |  | 20.00%
TUI Cruises |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in a joint venture, percentage of interest |  | 50.00%
Pullmantur and CDF Croisieres de France |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in a joint venture, percentage of interest |  | 49.00%
SkySea Cruises |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in a joint venture, percentage of interest |  | 37.00%
Silversea Cruises |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage of interests acquired | 66.70% |
Number of cruise ships | ship | 9 |
Number of continents of operations | continent | 7 |
Payments to acquire business | $ | $ 1,020 |

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