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Retirement Benefit Obligations - Rates of Increase in the Cost of Covered Health Care Benefits (Details) - Other post-retirement benefits
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
2023   6.00%
2024 7.50% 5.50%
2025 7.50% 5.30%
2026 7.30% 4.80%
2027 7.00% 4.50%
2028 6.80% 4.50%
2029 6.30% 4.50%
2030 6.00% 4.50%
2031 5.80% 4.50%
2032 5.50% 4.50%
2033 5.30% 4.50%
2034 5.00% 4.50%
2035 4.80% 4.50%
2036 and thereafter 4.50% 4.50%