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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 08, 2021
May 26, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]            
Redemption price percentage to change in control (as a percent)         101.00%  
Repayments of long-term debt         $ 2,100,000,000 $ 3,062,000,000
Loss on extinguishment of debt $ (38,000,000) $ (27,000,000) $ (45,000,000) $ (27,000,000) $ (50,000,000) $ (51,000,000)
Senior Unsecured Notes            
Debt Instrument [Line Items]            
Redemption price percentage to change in control (as a percent)         101.00%  
4.875% Senior Notes Due June 2028 | Senior Secured Notes            
Debt Instrument [Line Items]            
Stated interest rate on debt (as a percent) 4.875%   4.875%   4.875%  
Principal amount $ 1,600,000,000          
4.875% Senior Notes Due June 2028 | Senior Secured Notes | Debt Instrument, Redemption, Period One            
Debt Instrument [Line Items]            
Redemption price, percentage 100.00%          
4.875% Senior Notes Due June 2028 | Senior Secured Notes | Debt Instrument, Redemption, Period Two | Maximum            
Debt Instrument [Line Items]            
Maximum percentage of principal amount that can be redeemed 40.00%          
7.00% Senior Notes, Due March 2024            
Debt Instrument [Line Items]            
Stated interest rate on debt (as a percent) 7.00%          
Repayments of long-term debt $ 1,600,000,000