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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
May 23, 2019
Mar. 08, 2019
Dec. 30, 2018
Jun. 01, 2018
Mar. 26, 2018
Nov. 21, 2017
Oct. 17, 2017
Mar. 21, 2017
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 27, 2015
Dec. 02, 2013
Debt Instrument [Line Items]                              
Redemption price percentage due to change in control (as a percent)                   101.00%          
Repayments of long-term debt                   $ 4,406,000,000 $ 10,101,000,000 $ 14,203,000,000      
Loss on extinguishment of debt   $ 8,000,000               $ 42,000,000 119,000,000 $ 122,000,000      
Senior Unsecured Notes                              
Debt Instrument [Line Items]                              
Redemption price percentage due to change in control (as a percent)                   101.00%          
Loss on extinguishment of debt $ 32,000,000       $ 26,000,000                    
Revolving credit facility                              
Debt Instrument [Line Items]                              
Repayments of lines of credit               $ 350,000,000   $ 806,000,000          
Repayments of long-term debt                     $ 571,000,000        
Senior Secured Notes 6.50% Due March 2022                              
Debt Instrument [Line Items]                              
Stated interest rate               6.50%   6.50%          
Aggregate principal amount               $ 1,250,000,000              
Repurchased face amount               $ 1,100,000,000              
Senior Secured Notes 7.00% Due March 2024                              
Debt Instrument [Line Items]                              
Stated interest rate               7.00%   7.00%          
Aggregate principal amount               $ 2,000,000,000              
Redemption price percentage (as a percent)               100.00%              
Maximum percentage of the aggregate principal amount that may be redeemed with the net proceeds of certain equity offerings               40.00%              
Senior Secured Notes 5.50% Due November 2025                              
Debt Instrument [Line Items]                              
Stated interest rate                   5.50%          
Senior Secured Notes 5.50% Due November 2025 | Senior Notes                              
Debt Instrument [Line Items]                              
Stated interest rate             5.50%                
Aggregate principal amount           $ 750,000,000                  
Redemption price percentage (as a percent)             100.00%                
Maximum percentage of the aggregate principal amount that may be redeemed with the net proceeds of certain equity offerings             40.00%                
Senior Secured Notes 5.50% Due November 2025 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Aggregate principal amount             $ 1,000,000,000                
Repurchased face amount             $ 1,000,000,000                
Series F Tranche B Term Loan Facility                              
Debt Instrument [Line Items]                              
Repayments of lines of credit           $ 750,000,000                  
Repayments of long-term debt       $ 3,315,000,000                      
Loss on extinguishment of debt       $ 48,000,000                      
Senior Secured 5.75% Notes due August 2027 | Senior Notes                              
Debt Instrument [Line Items]                              
Stated interest rate   5.75%                          
Aggregate principal amount   $ 500,000,000                          
Redemption price percentage (as a percent)   100.00%                          
Maximum percentage of the aggregate principal amount that may be redeemed with the net proceeds of certain equity offerings   40.00%                          
5.75% Senior Secured Notes due 2027 | Senior Unsecured Notes                              
Debt Instrument [Line Items]                              
Stated interest rate       8.50%           8.50%          
Aggregate principal amount       $ 750,000,000                 $ 1,000,000,000    
Redemption price percentage (as a percent)       100.00%                      
Maximum percentage of the aggregate principal amount that may be redeemed with the net proceeds of certain equity offerings       40.00%                      
5.875% Senior Unsecured Notes due May 2023 | Senior Unsecured Notes                              
Debt Instrument [Line Items]                              
Stated interest rate   5.875%               5.875%       5.875%  
Aggregate principal amount                           $ 3,250,000,000  
Repayments of long-term debt $ 1,118,000,000 $ 584,000,000                          
5.625 % Senior Unsecured Notes due December 2021 | Senior Unsecured Notes                              
Debt Instrument [Line Items]                              
Stated interest rate   5.625%               5.625%         5.625%
Aggregate principal amount                             $ 900,000,000
Repayments of long-term debt   $ 518,000,000 $ 200,000,000           $ 182,000,000            
Senior Unsecured Notes due 2021                              
Debt Instrument [Line Items]                              
Aggregate principal amount                 $ 1,500,000,000