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Postretirement Benefit Plans - Schedule of Health Care Cost Trend Rates (Details) - Defined Benefit Postretirement Health And Life Coverage | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate assumed for next year | 8.00% | 7.00% | 7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.50% | 5.50% | 5.50%
Year that the rate reaches the ultimate trend rate | 2029 | 2028 | 2027

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