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Employee Benefits - Cash Flows (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Retirement Plans  
Information about the expected cash flows for retirement and post-retirement plans and impact of the Medicare subsidy  
2022 $ 70
2023 73
2024 75
2025 79
2026 82
2027-2031 447
Postretirement Plans  
Information about the expected cash flows for retirement and post-retirement plans and impact of the Medicare subsidy  
2022 3
2023 3
2024 3
2025 3
2026 2
2027-2031 $ 8