Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions |
Dec. 31, 2023
USD ($)
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Dec. 31, 2022
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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% |