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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Plan        
Retirement Plan Disclosure        
Service cost $ 7 $ 8 $ 22 $ 24
Interest cost 145 142 434 426
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (123) 123 (370) 369
Amortization of prior service cost (22) (22) (67) (66)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 25 (34) 75 (101)
Net periodic benefit cost as acutarially determined 32 39 94 116
Amount capitalized due to actions of regulator 0 (19) 0 58
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 32 58 94 174
Other Postretirement Benefit Plan        
Retirement Plan Disclosure        
Service cost 3 3 8 9
Interest cost 4 5 15 16
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0 0
Amortization of prior service cost (4) (4) (13) (13)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 0 0 0
Net periodic benefit cost as acutarially determined 3 4 10 12
Amount capitalized due to actions of regulator 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 3 $ 4 10 $ 12
Defined benefit plan contributions     16  
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 225