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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 75  
Pension Benefits    
Retirement Plan Disclosure    
Service cost 12 $ 12
Interest cost 104 123
Expected return on plan assets 122 (119)
Amortization of prior service cost (24) (25)
Recognized net actuarial loss (109) 82
Total net periodic benefit cost as actuarially determined 79 73
Amount capitalized due to actions of regulator 2 3
Total net periodic benefit cost 77 76
Other Post-retirement Benefits    
Retirement Plan Disclosure    
Defined benefit plan contributions 10  
Service cost 4 3
Interest cost 4 4
Expected return on plan assets 0 0
Amortization of prior service cost (6) (6)
Recognized net actuarial loss (2) 1
Total net periodic benefit cost as actuarially determined 4 2
Amount capitalized due to actions of regulator 0 0
Total net periodic benefit cost $ 4 $ 2