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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - FUTURE BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Expected contribution to defined benefit pension plans in next fiscal year $ 170
Estimated future benefit payments  
2021 251
2022 96
2023 93
2024 95
2025 90
2026 - 2030 399
Postretirement Benefits  
Estimated future benefit payments  
2021 75
2022 73
2023 71
2024 69
2025 67
2026 - 2030 $ 312