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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Compensation and employee benefits $ 131 $ 136
Interest 127 154
Programming related obligations 183 191
Legal, litigation, and regulatory 2 186
Accounts payable and other operating expenses 90 115
Total accounts payable and accrued liabilities $ 533 $ 782