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NOTES PAYABLE, FINANCE LEASES, AND COMMERCIAL BANK FINANCING - Accounts Receivable Securitization Facility (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Sep. 23, 2020
Line of Credit Facility [Line Items]      
Accounts receivable, net $ 1,058,000,000 $ 1,060,000,000  
Line of Credit Facility | A/R Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 250,000,000
Borrowings outstanding 173,000,000 177,000,000  
Line of Credit Facility | A/R Facility | DSPV      
Line of Credit Facility [Line Items]      
Accounts receivable, net $ 229,000,000 $ 228,000,000