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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension Plan    
Retirement Plan Disclosure    
Service cost $ 7 $ 9
Interest cost 144 142
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (124) 123
Amortization of prior service cost (22) (22)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 25 (34)
Net periodic benefit cost as acutarially determined 30 40
Amount capitalized due to actions of regulator 0 (19)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 30 59
Other Postretirement Benefit Plan    
Retirement Plan Disclosure    
Service cost 3 3
Interest cost 5 5
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0
Amortization of prior service cost (4) (4)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1) 0
Net periodic benefit cost as acutarially determined 3 4
Amount capitalized due to actions of regulator 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 3 $ 4
Defined benefit plan contributions 8  
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions 75  
401K [Member]    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 35