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Financing (Commercial Paper Programs And Credit Facilities) (Narrative) (Details)
€ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]            
Debt discounts, premiums and debt issuance costs $ 130,000,000 $ 130,000,000   $ 132,000,000    
Long-term debt 22,176,000,000 22,176,000,000   21,204,000,000    
Euro-denominated commercial paper | Commercial paper            
Line of Credit Facility [Line Items]            
Long-term debt $ 1,366,000,000 $ 1,366,000,000 € 1,200 611,000,000 € 500  
U.S. Dollar and Euro-Denominated Commercial Paper | Commercial paper            
Line of Credit Facility [Line Items]            
Debt, weighted average annual interest rate, basis points (0.06%) (0.06%) (0.06%)      
Long-term debt weighted average maturity 23 days          
Long-term debt, commerical paper $ 2,800,000,000 $ 2,800,000,000        
Floating rate senior unsecured notes due 2022 | Senior notes            
Line of Credit Facility [Line Items]            
Long-term debt 284,000,000 284,000,000   305,000,000    
2.05% senior unsecured notes due 2022 | Senior notes            
Line of Credit Facility [Line Items]            
Long-term debt 699,000,000 699,000,000   698,000,000    
Revolving credit facility | Five-Year Facility            
Line of Credit Facility [Line Items]            
Long-term debt       2,500,000,000    
Revolving credit facility | Five-Year Facility | Long-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity           $ 5,000,000,000
Additional borrowing capacity           2,500,000,000
Credit facility, borrowings outstanding $ 0 $ 0        
Revolving credit facility | Five-Year Facility | Long-term debt | Federal funds rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.50%        
Revolving credit facility | Five-Year Facility | Long-term debt | Eurodollar            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | Five-Year Facility | Minimum | Long-term debt            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.04%        
Debt instrument, covenants, leverage ratio 0.65 0.65 0.65      
Revolving credit facility | Five-Year Facility | Minimum | Long-term debt | LIBOR-based rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.585%        
Revolving credit facility | Five-Year Facility | Maximum | Long-term debt            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.125%        
Debt instrument, covenants, leverage ratio 1.00 1.00 1.00      
Revolving credit facility | Five-Year Facility | Maximum | Long-term debt | LIBOR-based rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | Superseded 364-Day Facility            
Line of Credit Facility [Line Items]            
Short-term debt       2,500,000,000    
Revolving credit facility | Superseded 364-Day Facility | Short-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity           $ 5,000,000,000
Revolving credit facility | Terminated 364-Day Credit Facility | Short-term debt            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity       $ 2,500,000,000