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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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