v3.20.1
Long-Term Debt and Revolving Credit Arrangements - Narrative (Details) - USD ($)
1 Months Ended
Sep. 30, 2019
Oct. 31, 2018
Apr. 30, 2018
Jul. 31, 2016
Mar. 31, 2020
Dec. 31, 2019
Jun. 13, 2018
Secured Loans | 2016 Senior Secured Term Loan              
Debt Instrument [Line Items]              
Proceeds from issuance of secured debt       $ 1,200,000,000      
Debt discount       23,000,000      
Debt issuance costs       $ 13,000,000      
Effective Interest Rate         6.10%   6.10%
Secured Loans | 2016 Senior Secured Term Loan | Level 2              
Debt Instrument [Line Items]              
Fair Value of long-term debt         $ 1,000,000,000.0    
Secured Loans | 2018 Senior Secured Term Loan              
Debt Instrument [Line Items]              
Proceeds from issuance of secured debt     $ 1,500,000,000        
Debt discount     8,000,000        
Debt issuance costs     $ 15,000,000        
Effective Interest Rate         6.20%    
Secured Loans | 2018 Senior Secured Term Loan | Level 2              
Debt Instrument [Line Items]              
Fair Value of long-term debt         $ 1,300,000,000    
Senior Note              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 2,000,000,000.0          
Senior Note | 2023 Senior Note              
Debt Instrument [Line Items]              
Debt issuance costs   $ 9,000,000          
Effective Interest Rate         7.70%    
Debt instrument term   5 years          
Stated interest rate   7.50%          
Aggregate principal amount   $ 500,000,000          
Senior Note | 2023 Senior Note | Level 2              
Debt Instrument [Line Items]              
Debt instrument, fair value disclosure         $ 491,000,000    
Senior Note | 2026 Senior Note              
Debt Instrument [Line Items]              
Effective Interest Rate         8.10%    
Debt instrument term   8 years          
Stated interest rate   8.00%          
Aggregate principal amount   $ 1,500,000,000          
Senior Note | 2026 Senior Note | Level 2              
Debt Instrument [Line Items]              
Debt instrument, fair value disclosure         $ 1,500,000,000    
Senior Note | 2027 Senior Note              
Debt Instrument [Line Items]              
Debt issuance costs $ 11,000,000            
Effective Interest Rate         7.70%    
Debt instrument term 8 years            
Stated interest rate 7.50%            
Aggregate principal amount $ 1,200,000,000            
Senior Note | 2027 Senior Note | Level 2              
Debt Instrument [Line Items]              
Debt instrument, fair value disclosure         $ 1,200,000,000    
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Borrowing capacity         2,300,000,000    
Line of credit balance         0    
Line of Credit | Letters of Credit              
Debt Instrument [Line Items]              
Letters of credit outstanding         580,000,000 $ 570,000,000  
Letters of credit outstanding that will reduce the available credit under facilities         $ 219,000,000 $ 213,000,000