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Long-term Debt (Summary of Long-term Debt) (Details) - Senior Notes
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Face amount   € 4,700,000,000 $ 14,873,000,000  
5.375% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   5.375% 5.375%  
Face amount     $ 500,000,000  
Long-term debt, fair value     $ 518,000,000 $ 509,000,000
5.500% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   5.50% 5.50%  
Face amount     $ 700,000,000  
Long-term debt, fair value     $ 744,000,000 706,000,000
5.750% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   5.75% 5.75%  
Face amount     $ 400,000,000  
Long-term debt, fair value     $ 444,000,000 407,000,000
5.875% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   5.875% 5.875%  
Face amount     $ 800,000,000  
Long-term debt, fair value     $ 896,000,000 812,000,000
4.375% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   4.375% 4.375%  
Face amount     $ 1,000,000,000  
Long-term debt, fair value     $ 1,026,000,000 915,000,000
3.625% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   3.625% 3.625%  
Face amount   € 1,300,000,000 $ 1,459,000,000  
Long-term debt, fair value     $ 1,565,000,000 1,446,000,000
Proceeds from convertible debt $ 1,421,000,000      
4.875% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   4.875% 4.875%  
Face amount     $ 1,600,000,000  
Long-term debt, fair value     $ 1,670,000,000 1,464,000,000
5.875% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   5.875% 5.875%  
Face amount     $ 1,900,000,000  
Long-term debt, fair value     $ 2,111,000,000 1,851,000,000
4.625% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   4.625% 4.625%  
Face amount   € 1,100,000,000 $ 1,234,000,000  
Long-term debt, fair value     $ 1,378,000,000 1,241,000,000
Proceeds from convertible debt 1,262,000,000      
6.375% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   6.375% 6.375%  
Face amount     $ 800,000,000  
Long-term debt, fair value     $ 916,000,000 797,000,000
3.875% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   3.875% 3.875%  
Face amount   € 1,200,000,000 $ 1,346,000,000  
Long-term debt, fair value     $ 1,429,000,000 0
Proceeds from convertible debt 1,343,000,000      
5.375% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   5.375% 5.375%  
Face amount     $ 900,000,000  
Long-term debt, fair value     $ 960,000,000 0
3.625% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   3.625% 3.625%  
Face amount   € 1,100,000,000 $ 1,234,000,000  
Long-term debt, fair value     $ 1,273,000,000 0
Proceeds from convertible debt $ 1,226,000,000      
4.875% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   4.875% 4.875%  
Face amount     $ 1,000,000,000  
Long-term debt, fair value     $ 1,019,000,000 $ 0