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FINANCING ARRANGEMENTS - Senior Secured Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
May 26, 2020
Jan. 16, 2020
May 23, 2019
Mar. 08, 2019
Jun. 01, 2018
Apr. 30, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Nov. 21, 2017
Oct. 17, 2017
Mar. 31, 2017
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               $ 5,642,000,000 $ 4,406,000,000 $ 10,101,000,000            
Loss on extinguishment of debt $ 27,000,000     $ 8,000,000       $ 59,000,000 $ 42,000,000 $ 119,000,000            
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                          
6.50% Senior Notes Due March 2022 | Senior Secured Notes                                
Debt Instrument [Line Items]                                
Stated interest rate               6.50%           6.50%    
Aggregate principal amount                           $ 1,250,000,000    
7.00 % Senior Notes Due March 2024 | Senior Secured Notes                                
Debt Instrument [Line Items]                                
Stated interest rate               7.00%           7.00%    
Aggregate principal amount                           $ 2,000,000,000    
5.50% Senior Notes Due November 2025 | Senior Secured Notes                                
Debt Instrument [Line Items]                                
Stated interest rate               5.50%         5.50%      
Aggregate principal amount                       $ 750,000,000 $ 1,000,000,000      
5.75% Senior Notes Due August 2027 | Senior Secured Notes                                
Debt Instrument [Line Items]                                
Stated interest rate       5.75%       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%                        
8.50% Senior Unsecured Notes Due January 2027 | Senior Unsecured Notes                                
Debt Instrument [Line Items]                                
Stated interest rate         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%  
Aggregate principal amount                             $ 3,250,000,000  
Repayments of long-term debt   $ 1,240,000,000 $ 1,118,000,000 $ 584,000,000                        
Loss on extinguishment of debt   $ 24,000,000                            
5.625 % Senior Unsecured Notes due December 2021 | Senior Unsecured Notes                                
Debt Instrument [Line Items]                                
Stated interest rate       5.625%                       5.625%
Aggregate principal amount                               $ 900,000,000
Repayments of long-term debt       $ 518,000,000   $ 182,000,000 $ 200,000,000                  
Senior Secured and Unsecured Notes                                
Debt Instrument [Line Items]                                
Aggregate principal amount           $ 1,500,000,000