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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 150  
Pension Benefits        
Retirement Plan Disclosure        
Service cost $ 13 $ 14 26 $ 28
Interest cost 95 93 189 184
Expected return on plan assets 109 (123) 218 (246)
Amortization of prior service cost (24) (25) (47) (49)
Recognized net actuarial loss (101) 115 (197) 227
Total net periodic benefit cost as actuarially determined 76 74 147 144
Amount capitalized due to actions of regulator 1 2 7 (9)
Total net periodic benefit cost 77 76 154 153
Other Post-retirement Benefits        
Retirement Plan Disclosure        
Defined benefit plan contributions     14  
Service cost 4 4 8 9
Interest cost 3 4 7 8
Expected return on plan assets 0   0 0
Amortization of prior service cost (4) (4) (8) (9)
Recognized net actuarial loss (2) 2 (3) 5
Total net periodic benefit cost as actuarially determined 5 6 10 13
Amount capitalized due to actions of regulator 0   0 0
Total net periodic benefit cost $ 5 $ 6 $ 10 $ 13