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PENSION AND POSTRETIREMENT BENEFIT PLANS - Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Expected contribution in 2021 $ 5
Estimated future undiscounted benefit payments  
2021 13
2022 2
2023 3
2024 2
2025 3
2026 to 2030 Payouts 11
Postretirement Benefits  
Defined Benefit Plan Disclosure  
Expected contribution in 2021 5
Estimated future undiscounted benefit payments  
2021 5
2022 5
2023 5
2024 5
2025 5
2026 to 2030 Payouts $ 27