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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75  
Pension Benefits    
Retirement Plan Disclosure    
Service cost 14 $ 12
Interest cost 91 104
Expected return on plan assets 123 (122)
Amortization of prior service cost (24) (24)
Recognized net actuarial loss (112) 109
Total net periodic benefit cost as actuarially determined 70 79
Amount capitalized due to actions of regulator 7 (2)
Total net periodic benefit cost 77 77
Other Post-retirement Benefits    
Retirement Plan Disclosure    
Defined benefit plan contributions 9  
Service cost 5 4
Interest cost 4 4
Expected return on plan assets 0 0
Amortization of prior service cost (5) (6)
Recognized net actuarial loss (3) 2
Total net periodic benefit cost as actuarially determined 7 4
Amount capitalized due to actions of regulator 0 0
Total net periodic benefit cost $ 7 $ 4