General (Details) destination in Thousands, passenger in Millions	Jul. 09, 2020	Dec. 31, 2021	Sep. 30, 2021 USD ($) brand continent ship passenger destination	Mar. 31, 2021 USD ($)	Mar. 19, 2021 USD ($) ship	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of cruise brands | brand			3
Number of cruise ships | ship			60
Number of destinations | destination			1
Number of continents | continent			7
Number of ships that have resumed or announced intention to resume sailing | ship			38
Number of ships that have resumed or announced intention to resume sailing, percentage			63.00%
Number of passengers that have sailed since resuming operations | passenger			0.5
Liquidity			$ 4,100,000,000
Cash and cash equivalents			$ 3,289,326,000			$ 3,684,474,000
Silversea Cruises
Schedule of Equity Method Investments [Line Items]
Interest acquired	33.30%
Scenario, Forecast
Schedule of Equity Method Investments [Line Items]
Number of ships that have resumed or announced intention to resume sailing, percentage		80.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Azamara
Schedule of Equity Method Investments [Line Items]
Number of ships sold | ship					3
Total consideration from sale					$ 201,000,000
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%
Unsecured Term Loan Agreement | Unsecured term loans
Schedule of Equity Method Investments [Line Items]
Debt instrument, face amount			$ 1,000,000,000	$ 1,000,000,000
Revolving Credit Facility
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity			100,000,000
Revolving Credit Facility | Unsecured Revolving Credit Facility Due 2024
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity			1,600,000,000	1,550,000,000
Line of Credit | Term Loan Facility, $700 Million
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity			$ 700,000,000	$ 700,000,000
TUI Cruises
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest			50.00%