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Debt And Lines Of Credit (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Debt Activity [Line Items]                
Revolving credit facilities available $ 1,900         $ 1,900    
Repayments of Commercial Paper       $ 410        
Maturities of long-term debt, 2024 138         138    
Maturities of long-term debt, 2025 189         189    
Maturities of long-term debt, 2026 143         143    
Maturities of long-term debt, 2027 333         333    
Maturities of long-term debt, 2028 670         $ 670    
Debt covenant compliance, minimum debt to capital ratio           60.00%    
Proceeds from Issuance of Debt         $ 210      
Debt Instrument, Covenant Description           9 billion    
Proceeds from Issuance of Commercial Paper             $ 410  
Minimum [Member]                
Schedule of Debt Activity [Line Items]                
Debt instrument, interest rate, stated percentage             3.00% 3.00%
Maximum [Member]                
Schedule of Debt Activity [Line Items]                
Debt instrument, interest rate, stated percentage             8.70% 8.70%
Commercial Paper [Member]                
Schedule of Debt Activity [Line Items]                
Revolving credit facilities available 1,000         $ 1,000    
Commercial Paper 0         0 $ 410  
Revolving Credit Facility [Member]                
Schedule of Debt Activity [Line Items]                
Revolving credit facilities available 1,400         1,400 1,500  
Receivables Securitization Program [Member]                
Schedule of Debt Activity [Line Items]                
Receivables securitization program 500         500    
Collateralized agreements, value of amount outstanding 0         0 0  
Other Debt Obligations [Member]                
Schedule of Debt Activity [Line Items]                
Repayments of Debt 87         $ 780    
Proceeds from Issuance of Debt $ 11     $ 600     354 $ 1,500
Environmental Debt Bond                
Schedule of Debt Activity [Line Items]                
Debt instrument, interest rate, stated percentage   2.90%   4.00%        
Repayments of Debt   $ 70 $ 49 $ 72        
Proceeds from Issuance of Debt       $ 72     $ 248  
Environmental Development Bond Due 2027                
Schedule of Debt Activity [Line Items]                
Proceeds from Issuance of Debt     24          
Environmental Debt Bond Due 2028                
Schedule of Debt Activity [Line Items]                
Proceeds from Issuance of Debt     54          
Environmental Development Bond Due 2030                
Schedule of Debt Activity [Line Items]                
Proceeds from Issuance of Debt     25          
Environmental Debt Bond Due 2023                
Schedule of Debt Activity [Line Items]                
Repayments of Debt     54          
Environmental Debt Bond Due June 2023                
Schedule of Debt Activity [Line Items]                
Repayments of Debt     $ 25