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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Pension Plan    
Retirement Plan Disclosure    
Service cost $ 9 $ 13
Interest cost 142 94
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (123) 109
Amortization of prior service cost (22) (23)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 34 (96)
Net periodic benefit cost as acutarially determined 40 71
Amount capitalized due to actions of regulator (19) 6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 59 77
Other Postretirement Benefit Plan    
Retirement Plan Disclosure    
Service cost 3 4
Interest cost 5 4
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) 0 (1)
Net periodic benefit cost as acutarially determined 4 5
Amount capitalized due to actions of regulator 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 4 $ 5
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 $ 29