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Borrowing and Lines of Credit (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Line of Credit Facility [Line Items]      
Commercial paper $ 0   $ 0
Proceeds from Issuance of Commercial Paper, Original Maturities Greater than 90 days 0 $ 0  
Repayments of Commercial Paper, Original Maturities Greater than 90 days $ 0 $ 200  
Average Years of Maturity of Long Term Debt 13 years    
Revolving Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000    
Borrowings outstanding 0    
Commercial Paper      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000