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Debt - Additional Information (Detail)
9 Months Ended
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Credit Facility      
Debt Instrument [Line Items]      
Credit facility   $ 2,000,000,000  
Credit facility borrowings outstanding   0 $ 0
Commitment fee on undrawn amounts 0.15%    
Letters of credit issued under the credit facility   15,000,000 15,000,000
Uncommitted Credit Facility | International Subsidiary One      
Debt Instrument [Line Items]      
Credit facility | € € 50,000,000    
Credit facility borrowings outstanding € 0   0
Senior Notes      
Debt Instrument [Line Items]      
Accrued interest related to senior notes   25,000,000 $ 65,000,000
5.95% senior notes due 2020      
Debt Instrument [Line Items]      
Senior unsecured notes principal amount   $ 750,000,000  
Debt, interest rate (percentage) 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    
Debt, interest rate (percentage) 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  
Debt, interest rate (percentage) 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  
Debt, interest rate (percentage) 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  
Debt, interest rate (percentage) 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 notes due 2030      
Debt Instrument [Line Items]      
Senior unsecured notes principal amount   $ 1,250,000,000  
Debt, interest rate (percentage) 3.25% 3.25%  
Senior notes issued price percentage 99.225% 99.225%  
Interest rate penalty 0.25%    
3.25% senior notes due 2030 | Notes prior to November 15, 2029      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
3.25% senior notes due 2030 | Notes on or after November 15, 2029      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
3.25% senior notes due 2030 | Upon the occurrence of certain change of control triggering events      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.00%    
LIBOR | Credit Facility      
Debt Instrument [Line Items]      
Basis points added to LIBOR rate 1.125%