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Financing (Commercial Paper Programs and Credit Facilities) (Narrative) (Details)
€ in Billions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Line of Credit Facility [Line Items]          
Debt discounts, premiums and debt issuance costs $ 130,000,000   $ 118,000,000    
Long-term debt $ 22,176,000,000   $ 19,677,000,000    
Euro-denominated commercial paper | Commercial paper          
Line of Credit Facility [Line Items]          
Debt, weighted average annual interest rate, basis points     1.89% 1.89%  
Long-term debt weighted average maturity 30 days        
Long-term debt, commercial paper     $ 2,000,000,000    
Long-term debt $ 1,366,000,000   2,013,000,000 € 1.9 € 1.2
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      
Option to extend period   1 year      
Additional borrowing capacity   $ 2,500,000,000      
Credit facility, borrowings outstanding     $ 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      
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      
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%