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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 225  
Pension Benefits        
Retirement Plan Disclosure        
Service cost $ 14 $ 14 42 $ 41
Interest cost 92 104 276 312
Expected return on plan assets 123 (122) 369 (366)
Amortization of prior service cost (24) (25) (73) (73)
Recognized net actuarial loss (113) 109 (340) 327
Total net periodic benefit cost as actuarially determined 72 80 216 241
Amount capitalized due to actions of regulator 5 (3) 14 11
Total net periodic benefit cost 77 77 230 230
Other Post-retirement Benefits        
Retirement Plan Disclosure        
Defined benefit plan contributions     20  
Service cost 5 4 14 12
Interest cost 4 4 12 12
Expected return on plan assets 0   0 0
Amortization of prior service cost (5) (6) (14) (18)
Recognized net actuarial loss (3) 2 (8) 7
Total net periodic benefit cost as actuarially determined 7 4 20 13
Amount capitalized due to actions of regulator 0   0 0
Total net periodic benefit cost $ 7 $ 4 $ 20 $ 13