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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions   $ 25    
Pension Benefits        
Retirement Plan Disclosure        
Service cost $ 11 33 $ 13 $ 40
Interest cost 125 374 118 355
Expected return on plan assets 119 358 (119) (358)
Amortization of prior service cost (25) (74) (25) (74)
Recognized net actuarial loss (84) (252) 103 307
Total net periodic benefit cost as actuarially determined 76 227 90 270
Amount capitalized due to actions of regulator 0 1 (13) (40)
Total net periodic benefit cost 76 228 77 230
Other Post-retirement Benefits        
Retirement Plan Disclosure        
Service cost 2 8 4 11
Interest cost 5 14 5 14
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (6) (18) (5) (16)
Recognized net actuarial loss (1) 3 1 5
Total net periodic benefit cost as actuarially determined 2 7 5 14
Amount capitalized due to actions of regulator 0 0 0 0
Total net periodic benefit cost $ 2 $ 7 $ 5 $ 14