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Debt - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]      
Short-term debt, weighted average interest rate (percent)   2.91% 3.43%
Line of credit facility, maximum borrowing capacity   $ 3,250  
Aggregate annual maturities of long-term debt, 2025   2,824  
Aggregate annual maturities of long-term debt, 2026   1,297  
Aggregate annual maturities of long-term debt, 2027   3,136  
Aggregate annual maturities of long-term debt, 2028   2,434  
Aggregate annual maturities of long-term debt, 2029   2,581  
Letters of credit issuable under credit facility   100  
Swingline loans issuable under credit facility   194  
Line of credit facility, maximum additional principal amount commitments   500  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt instrument, term (in years) 5 years    
Debt instrument, term extension (in years) 1 year    
Borrowings under credit facility   0 $ 0
Revolving Credit Facility [Member] | Maximum      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity   2,750  
Commercial Paper      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity   2,750  
Short-term debt   $ 400 $ 0