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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Plan        
Retirement Plan Disclosure        
Service cost $ 8 $ 13 $ 24 $ 39
Interest cost 142 94 426 283
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (123) 108 (369) 326
Amortization of prior service cost (22) (23) (66) (70)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 34 (97) 101 (294)
Net periodic benefit cost as acutarially determined 39 73 116 220
Amount capitalized due to actions of regulator (19) (3) 58 10
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 58 76 174 230
Other Postretirement Benefit Plan        
Retirement Plan Disclosure        
Service cost 3 5 9 13
Interest cost 5 4 16 11
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0 0
Amortization of prior service cost (4) (5) (13) (13)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 (2) 0 (5)
Net periodic benefit cost as acutarially determined 4 6 12 16
Amount capitalized due to actions of regulator 0   0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 4 $ 6 12 $ 16
Defined benefit plan contributions     19  
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     225  
401K [Member]        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 79