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FINANCING ARRANGEMENTS - Aggregate Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Remainder of 2021 $ 0  
2022 0  
2023 0  
2024 0  
2025 9,723  
2026 1,500  
Thereafter 11,362  
Total debt obligations 22,585 $ 24,185
Unamortized premiums, discounts and issuance costs (227)  
Total long-term debt and other $ 22,358 $ 23,925