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Employee Benefit Plans and Postretirement Benefits - Cash Flows Related to Total Benefits Expected to be Paid (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 105
2022 107
2023 109
2024 106
2025 110
2026 - 2030 569
Total 1,106
Healthcare  
Defined Benefit Plan Disclosure [Line Items]  
2021 32
2022 31
2023 29
2024 29
2025 28
2026 - 2030 133
Total 282
Medicare Part D Reimbursement  
Defined Benefit Plan Disclosure [Line Items]  
2021 0
2022 0
2023 0
2024 0
2025 0
2026 - 2030 (1)
Total (1)
Other  
Defined Benefit Plan Disclosure [Line Items]  
2021 30
2022 29
2023 30
2024 31
2025 31
2026 - 2030 153
Total $ 304