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Long-Term and Other Debt - Notes (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Feb. 14, 2018
USD ($)
Feb. 14, 2018
EUR (€)
Debt Instrument [Line Items]            
Document Period End Date Dec. 31, 2020          
Repurchase of notes $ 341,000,000 $ 2,523,000,000 $ 2,210,000,000      
Gain on early extinguishment of debt $ (1,000,000) $ (100,000,000) $ (93,000,000)      
Senior Notes | Senior Secured Notes, maturing 2025            
Debt Instrument [Line Items]            
Debt amount       $ 460,000,000 $ 900,000,000  
Senior Notes | Senior Secured Euro Notes, maturing 2026            
Debt Instrument [Line Items]            
Debt amount | €           € 325,000,000
Senior Notes | Senior Unsecured Euro Notes, maturing 2026            
Debt Instrument [Line Items]            
Debt amount | €           € 250,000,000