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FINANCING ARRANGEMENTS - Senior Secured Credit Facilities 2020 Activities (Details) - USD ($)
12 Months Ended
May 26, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Long-term debt   $ 23,925,000,000 $ 25,895,000,000
Term Loan B Facility Due June 2025 and November 2025      
Debt Instrument [Line Items]      
Repayment, outstanding debt $ 303,000,000    
Revolving credit facility      
Debt Instrument [Line Items]      
Repayments of lines of credit   471,000,000 806,000,000
Revolving credit facility | Term Loan B Facility Due June 2025 and November 2025      
Debt Instrument [Line Items]      
Repayment, outstanding debt $ 250,000,000    
Revolving credit facility | 2023 Revolving Credit Facility Due June 2023      
Debt Instrument [Line Items]      
Long-term debt   0 $ 0
Remaining availability   1,121,000,000  
Letter of Credit | 2023 Revolving Credit Facility Due June 2023      
Debt Instrument [Line Items]      
Long-term debt   $ 104,000,000