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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75  
Pension Benefits    
Retirement Plan Disclosure    
Service cost 13 $ 14
Interest cost 94 91
Expected return on plan assets 109 (123)
Amortization of prior service cost (23) (24)
Recognized net actuarial loss (96) 112
Total net periodic benefit cost as actuarially determined 71 70
Amount capitalized due to actions of regulator 6 7
Total net periodic benefit cost 77 77
Other Post-retirement Benefits    
Retirement Plan Disclosure    
Defined benefit plan contributions 10  
Service cost 4 5
Interest cost 4 4
Expected return on plan assets 0 0
Amortization of prior service cost (4) (5)
Recognized net actuarial loss (1) 3
Total net periodic benefit cost as actuarially determined 5 7
Amount capitalized due to actions of regulator 0 0
Total net periodic benefit cost $ 5 $ 7