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BASIS OF PRESENTATION (Details) - USD ($)
1 Months Ended 3 Months Ended
May 18, 2020
Dec. 31, 2014
Mar. 31, 2020
Jun. 15, 2020
Jun. 02, 2020
May 31, 2020
May 29, 2020
May 15, 2020
Apr. 30, 2020
Feb. 20, 2020
Dec. 31, 2019
May 31, 2015
Debt instrument                        
Available liquidity     $ 395,000,000                  
Unrestricted cash     67,000,000                  
Dividends paid   $ 6,000,000,000                    
Line of credit facility, maximum borrowing capacity     1,000,000,000                  
Debt carrying value     $ 4,860,000,000               $ 4,977,000,000 $ 6,800,000,000
Grace period     30 days                  
2014 Revolving Credit Facility                        
Debt instrument                        
Available borrowing capacity before a month-end minimum liquidity requirement     $ 328,000,000                  
Financial covenant minimum month end liquidity     150,000,000                  
Borrowing base     2,300,000,000                  
Subsequent Event                        
Debt instrument                        
Available liquidity           $ 165,000,000            
Unrestricted cash           148,000,000            
Line of credit facility, maximum borrowing capacity                 $ 900,000,000      
Aggregate book cash balance requirement         $ 40,000,000              
Subsequent Event | 2014 Revolving Credit Facility                        
Debt instrument                        
Available borrowing capacity before a month-end minimum liquidity requirement           $ 17,000,000            
Borrowing base $ 1,200,000,000                      
Senior Notes (Unsecured)                        
Debt instrument                        
Potential reduction in debt                   $ 1,000,000,000    
Senior Notes (Unsecured) | 5.5% Notes Due 2021                        
Debt instrument                        
Debt carrying value     $ 100,000,000               $ 100,000,000  
Debt instrument, interest rate, stated percentage     5.50%             5.50% 5.50%  
Senior Notes (Unsecured) | 6% Senior Notes due 2024                        
Debt instrument                        
Debt carrying value     $ 144,000,000               $ 144,000,000  
Debt instrument, interest rate, stated percentage     6.00%             6.00% 6.00%  
Senior Notes (Unsecured) | 6% Senior Notes due 2024 | Subsequent Event                        
Debt instrument                        
Interest not paid               $ 4,300,000        
Shared First Priority Lien | Subsequent Event                        
Debt instrument                        
Interest not paid             $ 51,000,000          
2017 Credit Agreement (Shared First Priority Lien)                        
Debt instrument                        
Debt carrying value     $ 1,300,000,000               $ 1,300,000,000  
2016 Credit Agreement (Shared First Priority Lien)                        
Debt instrument                        
Debt carrying value     1,000,000,000               1,000,000,000  
Second Lien Notes (Second Priority Lien)                        
Debt instrument                        
Debt carrying value     $ 1,809,000,000               $ 1,815,000,000  
Debt instrument, interest rate, stated percentage     8.00%               8.00%  
Second Lien Notes (Second Priority Lien) | Subsequent Event                        
Debt instrument                        
Interest not paid       $ 72,300,000