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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Plan        
Retirement Plan Disclosure        
Service cost $ 13 $ 14 $ 39 $ 42
Interest cost 94 92 283 276
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (108) 123 (326) 369
Amortization of prior service cost (23) (24) (70) (73)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 97 (113) 294 (340)
Net periodic benefit cost as acutarially determined 73 72 220 216
Amount capitalized due to actions of regulator (3) (5) (10) 14
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 76 77 230 230
Other Postretirement Benefit Plan        
Retirement Plan Disclosure        
Service cost 5 5 13 14
Interest cost 4 4 11 12
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0 0
Amortization of prior service cost (5) (5) (13) (14)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 2 (3) 5 (8)
Net periodic benefit cost as acutarially determined 6 7 16 20
Amount capitalized due to actions of regulator 0   0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 6 $ 7 16 $ 20
Defined benefit plan contributions     21  
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     225  
401K [Member]        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 75