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Debt and Credit Facilities (Narrative) (Details)
€ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2020
USD ($)
Nov. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2020
EUR (€)
Nov. 30, 2020
USD ($)
Mar. 31, 2020
Jan. 15, 2020
USD ($)
Line of Credit Facility [Line Items]                    
Commercial paper       $ 0            
Debt instrument, repurchased face amount | €             € 300      
Interest expense, debt       $ 315,000,000 $ 287,000,000 $ 264,000,000        
Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Leverage ratio 4.5     5.0         3.5  
Commercial Paper                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity       $ 1,500,000,000            
Maturities of time deposits       397 days            
Senior Unsecured Notes 4.375% Due 2020                    
Line of Credit Facility [Line Items]                    
Debt instrument, repurchased face amount                   $ 500,000,000
Stated interest rate       4.375%           4.375%
Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity $ 1,500,000,000                  
Debt instrument, term 364 days                  
Senior Unsecured Notes, 1.150% Due 2025                    
Line of Credit Facility [Line Items]                    
Stated interest rate     1.15% 1.15%            
Proceeds from issuance of debt     $ 650,000,000              
Senior Unsecured Notes, 1.950% Due 2030                    
Line of Credit Facility [Line Items]                    
Stated interest rate     1.95% 1.95%            
Proceeds from issuance of debt     $ 1,000,000,000              
Senior Unsecured Notes, 2.900% due 2050                    
Line of Credit Facility [Line Items]                    
Stated interest rate     2.90% 2.90%            
Proceeds from issuance of debt     $ 650,000,000              
Senior Unsecured Notes 0.600% due 2023                    
Line of Credit Facility [Line Items]                    
Stated interest rate       0.60%     0.60% 0.60%    
Proceeds from issuance of debt   $ 600,000,000                
Term Loan                    
Line of Credit Facility [Line Items]                    
Long-term debt       $ 400,000,000 $ 0     $ 400,000,000    
Term Loan | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Basis spread on variable rate   1.125%                
Floating Rate Notes due 2020                    
Line of Credit Facility [Line Items]                    
Debt instrument, repurchased face amount | €             € 300