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Debt - Narrative (Details)
Mar. 31, 2020
EUR (€)
credit_facility
Mar. 31, 2020
USD ($)
credit_facility
Feb. 27, 2020
USD ($)
Feb. 26, 2020
USD ($)
May 02, 2019
USD ($)
Debt Instrument [Line Items]          
Number of credit facilities | credit_facility 2 2      
Borrowings under credit facilities   $ 0      
Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, available credit   1,650,000,000      
2.80% Senior Notes Due March 2021 | Senior Notes          
Debt Instrument [Line Items]          
Debt face value   $ 400,000,000      
Debt interest rate percentage (as a percent) 2.80% 2.80%      
2.20% Senior Notes Due November 2022 | Senior Notes          
Debt Instrument [Line Items]          
Debt face value         $ 500,000,000
Debt interest rate percentage (as a percent)         2.20%
5.00% Senior Notes Due September 2020          
Debt Instrument [Line Items]          
Debt interest rate percentage (as a percent) 5.00% 5.00%      
5.00% Senior Notes Due September 2020 | Senior Notes          
Debt Instrument [Line Items]          
Debt face value   $ 600,000,000      
Debt interest rate percentage (as a percent) 5.00% 5.00%      
3.75% Senior Notes Due May 2, 2029          
Debt Instrument [Line Items]          
Debt interest rate percentage (as a percent) 3.75% 3.75%      
3.75% Senior Notes Due May 2, 2029 | Senior Notes          
Debt Instrument [Line Items]          
Debt face value         $ 750,000,000
Debt interest rate percentage (as a percent)         3.75%
Credit Facility Expiring February 2022 | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 900,000,000      
Credit Facility Expiring October 2023 | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   750,000,000 $ 750,000,000 $ 400,000,000  
Line of credit facility, increase of maximum borrowing capacity     $ 350,000,000    
Commercial paper          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   1,650,000,000      
Commercial paper | U.S. Program          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 600,000,000      
Commercial paper | European Program          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity | € € 525,000,000