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Debt Debt (Senior Notes Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
May 08, 2019
USD ($)
Nov. 05, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 05, 2018
EUR (€)
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage     100.00%    
Senior Unsecured Notes Due 2024 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes     $ 841 $ 857  
Long-term Debt, Gross $ 500        
Percentage of Face 99.895%        
Interest Rate     3.50%    
Maturity Date     May 08, 2024    
Senior Unsecured Notes Due 2023 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes     $ 499 0  
Interest Rate     1.125%    
Maturity Date     Sep. 26, 2023    
Senior Unsecured Notes Due 2019 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes     $ 0 343  
Interest Rate     3.25%    
Maturity Date     Oct. 15, 2019    
Senior Unsecured Notes Due 2025 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes     $ 337 343  
Interest Rate     1.25%    
Maturity Date     Dec. 11, 2025    
Senior Unsecured Notes Due 2027 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes     $ 558 $ 568  
Long-term Debt, Gross | €         € 500
Percentage of Face         99.231%
Interest Rate     2.125%    
Maturity Date     Mar. 01, 2027    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Repayments of Lines of Credit $ 156        
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Repayments of Lines of Credit     $ 1,100    
Senior Unsecured Term Loan Due 2021 [Member]          
Debt Instrument [Line Items]          
Repayments of Lines of Credit   $ 463