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Debt (Narrative) (Details) - USD ($) shares in Thousands			1 Months Ended								3 Months Ended		12 Months Ended
Debt (Narrative) (Details) - USD ($) shares in Thousands	Nov. 30, 2023	Feb. 28, 2023	Sep. 30, 2024	Aug. 31, 2024	Jun. 30, 2024	May 31, 2024	Mar. 31, 2024	Nov. 30, 2023	Oct. 31, 2023	Jun. 30, 2023	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Aug. 31, 2022
Long-Term Debt
Weighted average interest rate (as a percent)											5.03%		5.03%	6.06%
Minimum \| Up-front payment arrangement
Long-Term Debt
Credit agency fees, percentage of loan amount payable													2.35%
Maximum \| Up-front payment arrangement
Long-Term Debt
Credit agency fees, percentage of loan amount payable													5.48%
Unsecured senior notes
Long-Term Debt
Loss on extinguishment of debt													$ 61,000,000
Weighted average interest rate (as a percent)											5.59%		5.59%
Convertible notes
Long-Term Debt
Principal											$ 322,000,000		$ 322,000,000	$ 1,150,000,000
Weighted average interest rate (as a percent)											6.00%		6.00%
Secured senior notes
Long-Term Debt
Weighted average interest rate (as a percent)											0.00%		0.00%
Unsecured term loans
Long-Term Debt
Weighted average interest rate (as a percent)											3.27%		3.27%
Convertible Senior Notes Due 2025 \| Unsecured senior notes
Long-Term Debt
Interest rate				6.00%
Principal amount				$ 827,000,000
Convertible notes shares issued (in shares)				11,400
Convertible notes, cash portion				$ 827,000,000
Induced conversion of convertible debt													$ 119,000,000
Convertible Senior Notes Due 2025 \| Convertible notes
Long-Term Debt
Interest rate															6.00%
Convertible Senior Notes 4.25%, Due 2023 \| Convertible notes
Long-Term Debt
Interest rate										4.25%
Convertible notes shares issued (in shares)										374
Outstanding balance										$ 350,000,000
Convertible notes cash settlement										$ 338,000,000
Convertible Senior Notes 2.875%, Due 2023 \| Convertible notes
Long-Term Debt
Interest rate	2.875%							2.875%
Convertible notes shares issued (in shares)	147
Outstanding balance	$ 225,000,000							$ 225,000,000
Convertible notes cash settlement	$ 225,000,000							$ 225,000,000
Senior Unsecured Notes Due 2032 \| Unsecured senior notes
Long-Term Debt
Interest rate							6.25%
Principal							$ 1,250,000,000
Proceeds from unsecured debt							$ 1,240,000,000
Senior Notes Due 2027 \| Unsecured senior notes
Long-Term Debt
Interest rate							11.625%
Repayment of debt							$ 1,250,000,000
Loss on extinguishment of debt													116,000,000
Senior Unsecured Notes Due 2033 \| Unsecured senior notes
Long-Term Debt
Interest rate				6.00%
Principal				$ 2,000,000,000
Proceeds from unsecured debt				$ 1,980,000,000
Senior Notes Due 2029 \| Unsecured senior notes
Long-Term Debt
Interest rate				9.25%
Repayment of debt				$ 1,000,000,000
Senior Secured Notes Due 2029 \| Unsecured senior notes
Long-Term Debt
Interest rate				8.25%
Repayment of debt				$ 1,000,000,000
Loss on extinguishment of debt											$ 142,000,000
Senior Unsecured Notes Due 2031 \| Unsecured senior notes
Long-Term Debt
Interest rate			5.63%
Principal			$ 1,500,000,000
Proceeds from unsecured debt			$ 1,490,000,000
Senior Notes Due 2030 \| Unsecured senior notes
Long-Term Debt
Interest rate			7.25%
Repayment of debt			$ 700,000,000
Silver MoonTerm Loan Due 2028 \| Secured senior notes
Long-Term Debt
Repayment of debt											138,000,000
Senior Guaranteed Notes Due January 2030 \| Unsecured senior notes
Long-Term Debt
Interest rate		7.25%
Principal		$ 700,000,000
Senior Secured Notes Due 2025 \| Secured senior notes
Long-Term Debt
Interest rate														11.50%
Repayment of debt														$ 1,400,000,000
Loss on extinguishment of debt														$ 105,000,000
Silver Ray Unsecured Term Loan \| Unsecured term loans
Long-Term Debt
Interest rate						4.33%
Proceeds from unsecured debt						$ 507,000,000
Debt instrument, term (in years)						12 years
Silver Ray Unsecured Term Loan \| Unsecured term loans \| Euler Hermes
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency						95.00%
Utopia of the Seas Unsecured Term Loan \| Unsecured term loans
Long-Term Debt
Interest rate					3.00%							3.00%
Proceeds from unsecured debt					$ 1,500,000,000
Debt instrument, term (in years)					12 years
Utopia of the Seas Unsecured Term Loan \| Unsecured term loans \| BpiFAE
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency					100.00%
Export Credit Facilities
Long-Term Debt
Repayment of debt												$ 839,000,000
Novation Agreement \| Unsecured term loans
Long-Term Debt
Interest rate										4.21%
Proceeds from unsecured debt										$ 503,000,000
Debt instrument, term (in years)										12 years
Novation Agreement \| Unsecured term loans \| Euler Hermes
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency										95.00%
Celebrity Ascent Unsecured Term Loan \| Unsecured term loans
Long-Term Debt
Interest rate	3.18%							3.18%
Proceeds from unsecured debt								$ 844,000,000
Debt instrument, term (in years)								12 years
Margin on floating rate base (as a percent)								1.45%
Weighted average interest rate (as a percent)	3.33%							3.33%
Celebrity Ascent Unsecured Term Loan \| Unsecured term loans \| BpiFAE
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency								100.00%
Icon Of The Seas Unsecured Term Loan \| Unsecured term loans
Long-Term Debt
Interest rate	3.56%							3.56%
Proceeds from unsecured debt								$ 1,800,000,000
Debt instrument, term (in years)								12 years
Weighted average interest rate (as a percent)	4.76%							4.76%
Icon Of The Seas Unsecured Term Loan \| Unsecured term loans \| Minimum
Long-Term Debt
Margin on floating rate base (as a percent)								1.53%
Icon Of The Seas Unsecured Term Loan \| Unsecured term loans \| Maximum
Long-Term Debt
Margin on floating rate base (as a percent)								1.58%
Icon Of The Seas Unsecured Term Loan \| Unsecured term loans \| Euler Hermes
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency								95.00%
Icon Of The Seas Unsecured Term Loan \| Unsecured term loans \| Finnvera
Long-Term Debt
Percentage of unsecured term loan guaranteed by an export credit agency								100.00%
Credit agreement \| Term Loan Facility
Long-Term Debt
Debt terminated		$ 700,000,000
Debt instrument, term (in years)		364 days
Credit agreement \| Senior Unsecured Note, Backstop Committed Financing
Long-Term Debt
Debt terminated		$ 350,000,000
Revolving Credit Facility \| Credit agreement
Long-Term Debt
Increase in credit agreements											355,000,000
Remaining borrowing capacity											3,700,000,000		3,700,000,000
Revolving Credit Facility \| Aggregate Revolving Capacity, October 2024 \| Credit agreement
Long-Term Debt
Maximum borrowing capacity											4,100,000,000		4,100,000,000
Revolving Credit Facility \| Aggregate Revolving Capacity, October 2026 \| Credit agreement
Long-Term Debt
Maximum borrowing capacity											2,040,000,000.00		2,040,000,000.00
Revolving Credit Facility \| Aggregate Revolving Capacity, October 2028 \| Credit agreement
Long-Term Debt
Maximum borrowing capacity											$ 2,040,000,000.00		$ 2,040,000,000.00
Revolving Credit Facility \| Unsecured Term Loan Due October 2023 \| Credit agreement
Long-Term Debt
Remaining borrowing capacity									$ 600,000,000
Repayment of debt									$ 502,000,000