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BORROWINGS - Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Borrowings    
Long-term debt $ 3,029  
Financing lease obligations 222 $ 209
Total 3,251 209
Less: Unamortized discount 5  
Less: Unamortized debt issuance costs 15  
Less: current maturities of long-term debt 103 69
Total $ 3,128 $ 140
Debt instrument, weighted-average interest rate (as a percent) 2.70%  
Finance lease obligations, interest rate (as a percent) 1.40%