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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Pension Plan        
Retirement Plan Disclosure        
Service cost $ 8 $ 7 $ 15 $ 16
Interest cost 145 142 289 284
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (123) 123 (247) 246
Amortization of prior service cost (23) (22) (45) (44)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 25 (33) 50 (67)
Net periodic benefit cost as acutarially determined 32 37 62 77
Amount capitalized due to actions of regulator 0 (20) 0 39
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 32 57 62 116
Other Postretirement Benefit Plan        
Retirement Plan Disclosure        
Service cost 2 3 5 6
Interest cost 6 6 11 11
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0 0
Amortization of prior service cost (5) (5) (9) (9)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 1 0 0 0
Net periodic benefit cost as acutarially determined 4 4 7 8
Amount capitalized due to actions of regulator 0 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 4 $ 4 7 $ 8
Defined benefit plan contributions     11  
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     150  
401K [Member]        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 60