Changes in Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest rate swaps	$ (298)	$ (355)	$ (721)	$ (714)
Depreciation and amortization expenses	(393)	(362)	(780)	(721)
Other (expense) income	(3)	(5)	(11)	(1)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Gain (loss) on cash flow derivative hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	17	(16)	29	(15)
Interest rate swaps | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Gain (loss) on cash flow derivative hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest rate swaps	12	10	25	20
Foreign currency forward contracts | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Gain (loss) on cash flow derivative hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Depreciation and amortization expenses	(6)	(4)	(11)	(9)
Other (expense) income	0	(10)	0	(10)
Fuel swaps | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Gain (loss) on cash flow derivative hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income	0	0	0	0
Fuel	$ 11	$ (12)	$ 15	$ (16)