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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 150  
Pension Benefits        
Retirement Plan Disclosure        
Service cost $ 7 $ 13 16 $ 26
Interest cost 142 95 284 189
Expected return on plan assets 123 (109) 246 (218)
Amortization of prior service cost (22) (24) (44) (47)
Recognized net actuarial loss (33) 101 (67) 197
Total net periodic benefit cost as actuarially determined 37 76 77 147
Amount capitalized due to actions of regulator 20 1 39 (7)
Total net periodic benefit cost 57 77 116 154
Other Post-retirement Benefits        
Retirement Plan Disclosure        
Defined benefit plan contributions     12  
Service cost 3 4 6 8
Interest cost 6 3 11 7
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (5) (4) (9) (8)
Recognized net actuarial loss 0 2 0 3
Total net periodic benefit cost as actuarially determined 4 5 8 10
Amount capitalized due to actions of regulator 0   0 0
Total net periodic benefit cost $ 4 $ 5 $ 8 $ 10