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Employee Benefit Plans - MEC - Contributions and Benefit Payments (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Pension | U.S.  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments $ 13
2025 187
2026 183
2027 178
2028 171
2029 166
2030-2034 756
Pension | MEC | U.S.  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 7
2025 55
2026 54
2027 52
2028 50
2029 49
2030-2034 223
Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2025 53
2026 53
2027 53
2028 51
2029 49
2030-2034 217
Other Postretirement | U.S.  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 1
Other Postretirement | MEC  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 1
2025 22
2026 22
2027 22
2028 22
2029 22
2030-2034 $ 96