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Borrowings (Narrative) (Details)
$ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
May 31, 2020
USD ($)
Nov. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 31, 2020
USD ($)
Nov. 30, 2019
EUR (€)
Nov. 30, 2019
JPY (¥)
Debt Instrument [Line Items]                      
Weighted average interest rate           1.65%          
Line of credit facility, remaining borrowing capacity           $ 5,240.0          
Long-term debt         $ 13,817.9 16,586.6 $ 13,817.9        
Loss on extinguishment of debt           $ 0.0 $ 252.5 $ 0.0      
Description of derivative activity volume percent           9.00%          
Debt instrument, interest rate, effective percentage         2.88% 2.61% 2.88%        
Maturity Date, 2023                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity           $ 3,000.0          
Maturity Date, 2019                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity           $ 2,000.0          
Debt instrument, term           364 days          
Senior Notes                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt     $ 4,450.0                
Payments for repurchase and redemption of notes payable   $ 2,270.0                  
Repurchase aggregate principal amount   2,000.0                  
Long-term debt   2,010.0                  
Loss on extinguishment of debt         $ 252.5            
Senior Notes | Senior Notes Due May 2050 and September 2060                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt       $ 1,070.0              
Senior Notes | 2.25% notes due 2050                      
Debt Instrument [Line Items]                      
Debt instrument, face amount $ 1,000.0               $ 250.0    
Stated interest rate 2.25%         2.25%     2.25%    
Proceeds from issuance of debt $ 988.6                    
Senior Notes | 2.5% notes due 2060                      
Debt Instrument [Line Items]                      
Debt instrument, face amount                 $ 850.0    
Stated interest rate           2.50%     2.50%    
Senior Notes | 3.375% notes due 2029                      
Debt Instrument [Line Items]                      
Debt instrument, face amount     $ 1,150.0                
Stated interest rate     3.375%     3.375%          
Senior Notes | 3.875% notes due 2039                      
Debt Instrument [Line Items]                      
Debt instrument, face amount     $ 850.0                
Stated interest rate     3.875%     3.875%          
Senior Notes | 3.95% notes due 2049                      
Debt Instrument [Line Items]                      
Debt instrument, face amount     $ 1,500.0                
Stated interest rate     3.95%     3.95%          
Senior Notes | 4.15% notes due 2059                      
Debt Instrument [Line Items]                      
Debt instrument, face amount     $ 1,000.0                
Stated interest rate     4.15%     4.15%          
Senior Notes | November 2019 Euro-denominated Notes                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt   $ 1,750.0                  
Senior Notes | 0.625% Euro denominated notes due 2031                      
Debt Instrument [Line Items]                      
Debt instrument, face amount | €                   € 600,000,000.0  
Stated interest rate   0.625%       0.625%       0.625% 0.625%
Senior Notes | 1.7% Euro denominated notes due 2049                      
Debt Instrument [Line Items]                      
Debt instrument, face amount | €                   € 1,000,000,000.00  
Stated interest rate   1.70%       1.70%       1.70% 1.70%
Senior Notes | November 2019 Yen-denominated Notes                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt   $ 356.6                  
Senior Notes | 0.42% Japanese Yen denominated notes due 2029                      
Debt Instrument [Line Items]                      
Debt instrument, face amount | ¥                     ¥ 22,920,000,000
Stated interest rate   0.42%       0.42%       0.42% 0.42%
Senior Notes | 0.56% Japanese Yen denominated notes due 2034                      
Debt Instrument [Line Items]                      
Debt instrument, face amount | ¥                     ¥ 9,280,000,000
Stated interest rate   0.56%       0.56%       0.56% 0.56%
Senior Notes | 0.97% Japanese Yen denominated notes due 2049                      
Debt Instrument [Line Items]                      
Debt instrument, face amount | ¥                     ¥ 7,640,000,000
Stated interest rate   0.97%       0.97%       0.97% 0.97%