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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 225  
Pension Benefits        
Retirement Plan Disclosure        
Service cost $ 8 $ 13 24 $ 39
Interest cost 142 94 426 283
Expected return on plan assets 123 (108) 369 (326)
Amortization of prior service cost (22) (23) (66) (70)
Recognized net actuarial loss (34) 97 (101) 294
Total net periodic benefit cost as actuarially determined 39 73 116 220
Amount capitalized due to actions of regulator 19 3 (58) (10)
Total net periodic benefit cost 58 76 174 230
Other Post-retirement Benefits        
Retirement Plan Disclosure        
Defined benefit plan contributions     19  
Service cost 3 5 9 13
Interest cost 5 4 16 11
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (4) (5) (13) (13)
Recognized net actuarial loss 0 2 0 5
Total net periodic benefit cost as actuarially determined 4 6 12 16
Amount capitalized due to actions of regulator 0   0 0
Total net periodic benefit cost $ 4 $ 6 $ 12 $ 16