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Debt - Narrative (Details) shares in Millions, $ in Millions	1 Months Ended				9 Months Ended
	Aug. 31, 2025 USD ($) shares	Jul. 31, 2025 USD ($)	May 31, 2025 USD ($) amendment	Mar. 31, 2025 USD ($) shares	Sep. 30, 2025	Oct. 31, 2025 USD ($)
Long-Term Debt
Number of revolving credit facilities amendments \| amendment			2
Minimum \| Contract with Customer, Liability, Up-Front Payment Arrangement
Long-Term Debt
Credit agency fees, percentage of loan amount payable					2.35%
Maximum \| Contract with Customer, Liability, Up-Front Payment Arrangement
Long-Term Debt
Credit agency fees, percentage of loan amount payable					5.48%
Convertible notes \| Convertible Senior Notes Due 2025
Long-Term Debt
Fixed interest rate	6.00%			6.00%
Convertible notes payable	$ 106
Cash settlement amount	$ 109
Principal amount				$ 213
Convertible notes shares issued (in shares) \| shares	1.8			3.0
Convertible notes, cash portion				$ 214
Unsecured senior notes \| Senior Unsecured Notes Due 2036 \| Subsequent Event
Long-Term Debt
Fixed interest rate						5.375%
Face amount						$ 1,500
Unsecured term loans \| Star Of The Seas Unsecured Term Loan
Long-Term Debt
Fixed interest rate		3.76%
Proceeds from issuance debt		$ 1,600
Debt instrument, term (in years)		12 years
Unsecured term loans \| Star Of The Seas Unsecured Term Loan \| Finnvera PLC.
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency		95.00%
Revolving Credit Facility \| Line of Credit \| Aggregate Revolving Capacity
Long-Term Debt
Maximum borrowing capacity			$ 6,400