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Borrowing and Lines of Credit (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Aug. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]        
Maximum Commercial Paper Borrowing Authority $ 5,000      
Commercial paper $ 1,000     $ 500
Commercial Paper, Weighted Average Interest Rate 5.60%     4.40%
Proceeds from Issuance of Commercial Paper, Original Maturities Greater than 90 days $ 0 $ 1,400    
Repayments of Commercial Paper, Original Maturities Greater than 90 days $ 200 $ 0    
Average Years of Maturity of Long Term Debt 14 years      
5.0B Revolving Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000      
Borrowings outstanding $ 0      
$2.0B September revolving credit agreement [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,000  
Borrowings outstanding     $ 0