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Debt - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Write-off of debt issuance costs and debt discounts or premiums $ 457,000,000      
Outstanding borrowings 9,095,000,000 $ 9,095,000,000   $ 9,458,000,000
Debt repurchased amount 160,000,000 160,000,000    
Senior notes        
Debt Instrument [Line Items]        
Debt repurchased amount 160,000,000 160,000,000    
Debt repurchased 95,000,000 95,000,000    
Gains (losses) on repurchases of debt   65,000,000    
Revolving credit facility        
Debt Instrument [Line Items]        
Revolving credit, maximum borrowing capacity 4,000,000,000.0 4,000,000,000.0    
Revolving credit, outstanding $ 54,000,000 $ 54,000,000    
Revolving credit facility | Alternative base rate (ABR) | Minimum        
Debt Instrument [Line Items]        
Variable rate percentage   1.50%    
Revolving credit facility | London interbank offered rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Variable rate percentage   2.50%    
FLLO Term Loan Facility | Term Loan        
Debt Instrument [Line Items]        
Applicable margin 7.00%      
Applicable margin increase 0.0200 0.0200    
FLLO Term Loan Facility | Term Loan | Alternative base rate (ABR)        
Debt Instrument [Line Items]        
Variable rate percentage 3.25%      
FLLO Term Loan Facility | Term Loan | London interbank offered rate (LIBOR)        
Debt Instrument [Line Items]        
Variable rate percentage 8.00%      
Debtor-in-Possession Credit Agreement        
Debt Instrument [Line Items]        
Revolving credit, maximum borrowing capacity     $ 2,104,000,000  
Debtor-in-Possession Credit Agreement | Term Loan        
Debt Instrument [Line Items]        
Debt     1,179,000,000  
Debtor-in-Possession Credit Agreement | Revolving credit facility        
Debt Instrument [Line Items]        
Revolving credit, maximum borrowing capacity     925,000,000  
Revolving credit, outstanding     $ 200,000,000