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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($)
1 Months Ended 9 Months Ended
Jan. 16, 2020
Mar. 08, 2019
Apr. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]          
Redemption price percentage to change in control (as a percent)       101.00%  
Repayments of long-term debt       $ 3,162,000,000 $ 3,956,000,000
Senior Unsecured Notes          
Debt Instrument [Line Items]          
Redemption price percentage to change in control (as a percent)       101.00%  
Repayments of long-term debt       $ 26,000,000  
5.75% Senior Notes Due August 2027 | Senior Secured Notes          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent)   5.75%      
Principal amount   $ 500,000,000      
8.50% Senior Notes Due January 2027 | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent)   8.50%   8.50%  
Principal amount   $ 1,000,000,000      
5.875% Senior Notes Due May 2023 | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent)   5.875%   5.875%  
Repayments of long-term debt $ 1,240,000,000 $ 584,000,000      
5.625% Senior Notes Due December 2021 | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent)   5.625%      
Repayments of long-term debt   $ 518,000,000 $ 182,000,000    
5.50% Senior Notes Due March 2023 | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent)   5.50%   5.50%  
Repayments of long-term debt   $ 216,000,000      
Senior Secured Notes and Senior Unsecured Notes          
Debt Instrument [Line Items]          
Principal amount     $ 1,500,000,000