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Long-Term and Other Debt - Notes (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 14, 2018
USD ($)
Feb. 14, 2018
EUR (€)
Debt Instrument [Line Items]                
Document Period End Date       Dec. 31, 2019        
Repurchase of notes       $ 2,523,000,000 $ 2,210,000,000 $ 1,693,000,000    
Gain on early extinguishment of debt $ (93,000,000) $ 40,000,000 $ (60,000,000) $ (100,000,000) $ (93,000,000) $ (38,000,000)    
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