Changes in Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net of interest capitalized	$ (236)	$ (228)	$ (514)	$ (477)
Depreciation and amortization expenses	(464)	(417)	(925)	(829)
Income before income taxes	(1,150)	(1,232)	(2,126)	(1,983)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income \| Changes related to cash flow derivative hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	58	(4)	76	1
Interest rate swaps \| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income \| Changes related to cash flow derivative hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net of interest capitalized	3	6	7	13
Foreign currency forward contracts \| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income \| Changes related to cash flow derivative hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Depreciation and amortization expenses	(5)	(6)	(10)	(12)
Fuel swaps \| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income \| Changes related to cash flow derivative hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Fuel	$ 60	$ (4)	$ 79	$ 0

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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