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FINANCING ARRANGEMENTS - Aggregate Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Remainder of 2020 $ 4  
2021 0  
2022 1,553  
2023 2,447  
2024 2,303  
2025 10,632  
Thereafter 7,762  
Total debt obligations 24,701 $ 26,188
Unamortized premiums, discounts and issuance costs (273)  
Total long-term debt and other $ 24,428 $ 25,895