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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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