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Employee Benefit Plans - MEC - Contributions and Benefit Payments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension | United States  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments $ 13
2022 210
2023 203
2024 195
2025 193
2026 193
2027-2031 837
Pension | MEC | United States  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 7
2022 56
2023 55
2024 54
2025 52
2026 51
2027-2031 229
Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2022 54
2023 54
2024 54
2025 53
2026 51
2027-2031 229
Other Postretirement | United States  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 5
Other Postretirement | MEC  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit payments 3
2022 21
2023 22
2024 22
2025 22
2026 22
2027-2031 $ 98