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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75  
Pension Benefits    
Retirement Plan Disclosure    
Service cost 7 $ 9
Interest cost 144 142
Expected return on plan assets 124 (123)
Amortization of prior service cost (22) (22)
Recognized net actuarial loss (25) 34
Total net periodic benefit cost as actuarially determined 30 40
Amount capitalized due to actions of regulator 0 19
Total net periodic benefit cost 30 59
Other Post-retirement Benefits    
Retirement Plan Disclosure    
Defined benefit plan contributions 8  
Service cost 3 3
Interest cost 5 5
Expected return on plan assets 0 0
Amortization of prior service cost (4) (4)
Recognized net actuarial loss 1 0
Total net periodic benefit cost as actuarially determined 3 4
Amount capitalized due to actions of regulator 0 0
Total net periodic benefit cost $ 3 $ 4