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Debt Second Lien Notes due 2028 (Details) - Secured Debt - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Jan. 28, 2020
Feb. 01, 2019
Feb. 21, 2018
Second Lien Notes Due 2028            
Debt Instrument [Line Items]            
Aggregate principal amount       $ 1,300    
Interest rate     6.25% 6.25%    
Redemption price, percent   101.00%        
Second Lien Notes Due 2028 | Debt Instrument, Redemption, Period One            
Debt Instrument [Line Items]            
Redemption price, percent of principal 100.00%          
Redemption price, percent 40.00%          
Redemption price percentage if 50 of principal remains 106.25%          
Redemption price percent of principal amount remaining 50.00%          
Second Lien Notes Due 2028 | Debt Instrument, Redemption, Period Two            
Debt Instrument [Line Items]            
Redemption price, percent 103.125%          
Second Lien Notes Due 2028 | Debt Instrument, Redemption, Period Three            
Debt Instrument [Line Items]            
Redemption price, percent 101.563%          
Second Lien Notes Due 2028 | Debt Instrument, Redemption, Period Four            
Debt Instrument [Line Items]            
Redemption price, percent 100.00%          
Prime Notes            
Debt Instrument [Line Items]            
Interest rate     9.25%      
Repurchased face amount         $ 1,200 $ 300