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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension Plan    
Retirement Plan Disclosure    
Service cost $ 8 $ 7
Interest cost 131 144
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (126) 124
Amortization of prior service cost (22) (22)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 42 (25)
Net periodic benefit cost as acutarially determined 33 30
Other Postretirement Benefit Plan    
Retirement Plan Disclosure    
Service cost 3 3
Interest cost 4 5
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0
Amortization of prior service cost (4) (4)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 1
Net periodic benefit cost as acutarially determined 3 $ 3
Defined benefit plan contributions 8  
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75