Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions	Dec. 31, 2023 USD ($) T	Dec. 31, 2022 USD ($) T
Derivative instruments disclosure
Estimated unrealized net gains (losses) associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from other accumulated comprehensive income (loss) \| $	$ (21)	$ (8)
2024
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	1,054,501,000	825,651,000
Percentage of projected requirements	61.00%	50.00%
2025
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	685,400,000	0
Percentage of projected requirements	39.00%	0.00%
2026
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	44,200,000	0
Percentage of projected requirements	3.00%	0.00%

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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.

+ References

No definition available.

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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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