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RETIREMENT BENEFITS - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
U.S. | Pension Plans  
Defined Benefit Plan, Postretirement Medical Plan with Prescription Drug Benefits [Abstract]  
2021 $ 820
2022 832
2023 847
2024 852
2025 857
2026–2030 4,101
U.S. | Postretirement Benefit Plans  
Defined Benefit Plan, Postretirement Medical Plan with Prescription Drug Benefits [Abstract]  
2021 58
2022 55
2023 52
2024 49
2025 45
2026–2030 181
Non-U.S. | Pension Plans  
Defined Benefit Plan, Postretirement Medical Plan with Prescription Drug Benefits [Abstract]  
2021 566
2022 504
2023 507
2024 521
2025 527
2026–2030 2,698
Non-U.S. | Postretirement Benefit Plans  
Defined Benefit Plan, Postretirement Medical Plan with Prescription Drug Benefits [Abstract]  
2021 76
2022 80
2023 85
2024 90
2025 96
2026–2030 $ 550