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Debt - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Jun. 30, 2015
EUR (€)
Senior Notes          
Debt Instrument [Line Items]          
Accrued interest related to senior notes $ 76,000,000   $ 65,000,000    
Credit Facility          
Debt Instrument [Line Items]          
Credit facility $ 2,000,000,000        
Commitment fee on undrawn amounts 0.15%        
Letters of credit issued under the credit facility $ 16,000,000   15,000,000    
Uncommitted Credit Facility | International Subsidiary One          
Debt Instrument [Line Items]          
Credit facility | €   € 50,000,000      
Credit facility borrowings outstanding 0   $ 0    
5.95% senior notes due 2020          
Debt Instrument [Line Items]          
Senior unsecured notes principal amount $ 750,000,000        
Senior notes, interest rate 5.95% 5.95% 5.95% 5.95%  
Senior notes issued price percentage 99.893% 99.893%      
Debt instrument redemption price percentage 100.00%        
5.95% senior notes due 2020 | Upon the occurrence of certain change of control triggering events          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage 101.00%        
2.5% (€650 million) senior notes due 2022          
Debt Instrument [Line Items]          
Senior unsecured notes principal amount | €   € 650,000,000   € 650,000,000 € 650,000,000
Senior notes, interest rate 2.50% 2.50% 2.50% 2.50% 2.50%
Senior notes issued price percentage 99.525% 99.525%      
Debt instrument redemption price percentage 100.00%        
2.5% (€650 million) senior notes due 2022 | Upon the occurrence of certain change of control triggering events          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage 101.00%        
4.5% senior notes due 2024          
Debt Instrument [Line Items]          
Senior unsecured notes principal amount $ 500,000,000        
Senior notes, interest rate 4.50% 4.50% 4.50% 4.50%  
Senior notes issued price percentage 99.444% 99.444%      
Debt instrument redemption price percentage 100.00%        
4.5% senior notes due 2024 | Upon the occurrence of certain change of control triggering events          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage 101.00%        
5.0% senior notes due 2026          
Debt Instrument [Line Items]          
Senior unsecured notes principal amount $ 750,000,000        
Senior notes, interest rate 5.00% 5.00% 5.00% 5.00%  
Senior notes issued price percentage 99.535% 99.535%      
Debt instrument redemption price percentage 100.00%        
5.0% senior notes due 2026 | Upon the occurrence of certain change of control triggering events          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage 101.00%        
3.8% senior notes due 2028          
Debt Instrument [Line Items]          
Senior unsecured notes principal amount $ 1,000,000,000        
Senior notes, interest rate 3.80% 3.80% 3.80% 3.80%  
Senior notes issued price percentage 99.747% 99.747%      
Debt instrument redemption price percentage 100.00%        
3.8% senior notes due 2028 | Upon the occurrence of certain change of control triggering events          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage 101.00%        
3.25% senior dues due 2030          
Debt Instrument [Line Items]          
Senior unsecured notes principal amount $ 1,250,000,000        
Senior notes, interest rate 3.25% 3.25%      
Senior notes issued price percentage 99.225% 99.225%      
Interest rate penalty 0.25%        
3.25% senior dues due 2030 | Debt Instrument, Redemption, Period Three [Member]          
Debt Instrument [Line Items]          
Senior notes, interest rate 3.25% 3.25%      
Debt instrument redemption price percentage 100.00%        
London Interbank Offered Rate (LIBOR) | Credit Facility          
Debt Instrument [Line Items]          
Basis points added to LIBOR rate 1.125%