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