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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75  
Pension Benefits    
Retirement Plan Disclosure    
Service cost 8 $ 7
Interest cost 131 144
Expected return on plan assets 126 (124)
Amortization of prior service cost (22) (22)
Recognized net actuarial loss (42) 25
Total net periodic benefit cost as actuarially determined 33 30
Other Post-retirement Benefits    
Retirement Plan Disclosure    
Defined benefit plan contributions 8  
Service cost 3 3
Interest cost 4 5
Expected return on plan assets 0 0
Amortization of prior service cost (4) (4)
Recognized net actuarial loss 0 (1)
Total net periodic benefit cost as actuarially determined $ 3 $ 3