Changes in Accumulated Other Comprehensive (Loss) Income (Reclassifications) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net of interest capitalized		$ (1,402)	$ (1,364)	$ (1,292)
Depreciation and amortization expenses		(1,455)	(1,407)	(1,293)
Other (expense) income	[1]	(8)	(119)	20
Reclassification out of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period		30	160	(25)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period		30	163	(21)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Interest rate swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net of interest capitalized		49	(12)	(44)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Foreign currency forward contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Depreciation and amortization expenses		(18)	(17)	(15)
Other (expense) income		(10)	(3)	(3)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Fuel swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income		0	0	0
Fuel		9	195	41
Reclassification out of accumulated other comprehensive income (loss) | Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Payroll and related		$ 0	$ (3)	$ (4)

[1] Including a $62.6 million net loss related to the 2021 elimination of the Silversea Cruises reporting lag for the year ended December 31, 2021.