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Long-Term Debt and Credit Facilities - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2020
USD ($)
Aug. 31, 2019
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
EUR (€)
Nov. 30, 2018
USD ($)
Debt Instrument [Line Items]                    
Weighted-average interest rate on short term borrowings     4.80% 1.80%   4.80%        
Debt instrument term 364 days                  
Loss on early extinguishment of debt           $ 23 $ 0 $ 0    
Unused borrowing capacity     $ 4,657     $ 4,657        
Amended Domestic Revolving Credit Facility 2650 Million Capacity                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity                   $ 2,650
Term extension   1 year                
Amended Foreign Revolving Credit Facility 1500 Million Capacity                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 1,500                  
Seven Year notes at 0.50 Percent                    
Debt Instrument [Line Items]                    
Face amount | €                 € 500,000,000  
Debt instrument term         7 years          
Fixed interest rate         0.50%       0.50%  
Fifteen Year notes at 1.375 Percent                    
Debt Instrument [Line Items]                    
Face amount | €                 € 500,000,000  
Debt instrument term         15 years          
Fixed interest rate         1.375%       1.375%  
Two Year Notes at 0.00 Percent                    
Debt Instrument [Line Items]                    
Face amount | €       € 500,000,000            
Debt instrument term       2 years            
Fixed interest rate       0.00%            
Twenty Year Notes at 0.875 Percent                    
Debt Instrument [Line Items]                    
Face amount | €       € 500,000,000            
Debt instrument term       20 years            
Fixed interest rate       0.875%            
1.75 Percent                    
Debt Instrument [Line Items]                    
Face amount         $ 500       € 500,000,000  
Fixed interest rate         1.75%       1.75%  
2.45% Notes Due 2021                    
Debt Instrument [Line Items]                    
Fixed interest rate     2.45%     2.45%        
Repayments of Debt     $ 300              
2.30% Notes Due 2022                    
Debt Instrument [Line Items]                    
Fixed interest rate     2.30%     2.30%        
Repayments of Debt     $ 500              
2.45% Notes Due 2021 and 2.30% Notes Due 2022                    
Debt Instrument [Line Items]                    
Loss on early extinguishment of debt     $ 23