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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75  
Pension Benefits    
Retirement Plan Disclosure    
Service cost 9 $ 13
Interest cost 142 94
Expected return on plan assets 123 (109)
Amortization of prior service cost (22) (23)
Recognized net actuarial loss (34) 96
Total net periodic benefit cost as actuarially determined 40 71
Amount capitalized due to actions of regulator 19 (6)
Total net periodic benefit cost 59 77
Other Post-retirement Benefits    
Retirement Plan Disclosure    
Defined benefit plan contributions 8  
Service cost 3 4
Interest cost 5 4
Expected return on plan assets 0 0
Amortization of prior service cost (4) (4)
Recognized net actuarial loss 0 1
Total net periodic benefit cost as actuarially determined 4 5
Amount capitalized due to actions of regulator 0 0
Total net periodic benefit cost $ 4 $ 5