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Long-term Debt - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]        
Aggregate outstanding principal     $ 10,305,023 $ 10,360,058
Debt issuance costs     87,000  
Debt Instrument [Line Items]        
Principal amount at par     10,392,000  
Senior Notes        
Debt Instrument [Line Items]        
Principal amount at par | €   € 2,400,000,000    
Redemption prices, percent of outstanding principal 101.00%      
Senior Notes | 3.625% Senior Notes        
Debt Instrument [Line Items]        
Principal amount at par   1,300,000,000 1,458,000  
Proceeds from convertible debt $ 1,421,000      
Senior Notes | 4.625% Senior Notes        
Debt Instrument [Line Items]        
Principal amount at par   € 1,100,000,000 $ 1,234,000  
Proceeds from convertible debt $ 1,262,000