Fair Value Measurements and Derivative Instruments - Schedule of Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions	Mar. 31, 2024 USD ($) T	Dec. 31, 2023 USD ($) T
Derivative Instruments
Estimated unrealized net gain (loss) associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from accumulated other comprehensive income loss \| $	$ 39	$ (21)
2024
Derivative Instruments
Fuel Swap Agreements (metric tons)	789,801	1,054,501
Percentage of projected requirements	62.00%	61.00%
2025
Derivative Instruments
Fuel Swap Agreements (metric tons)	773,700	685,400
Percentage of projected requirements	45.00%	39.00%
2026
Derivative Instruments
Fuel Swap Agreements (metric tons)	252,700	44,200
Percentage of projected requirements	15.00%	3.00%

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Nominal number of units used to calculate payment on derivative.

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The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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