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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Plan    
Retirement Plan Disclosure    
Service cost $ 13 $ 14
Interest cost 94 91
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (109) 123
Amortization of prior service cost (23) (24)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 96 (112)
Net periodic benefit cost as acutarially determined 71 70
Amount capitalized due to actions of regulator (6) (7)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 77 77
Other Postretirement Benefit Plan    
Retirement Plan Disclosure    
Service cost 4 5
Interest cost 4 4
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0
Amortization of prior service cost (4) (5)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 1 (3)
Net periodic benefit cost as acutarially determined 5 7
Amount capitalized due to actions of regulator 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 5 $ 7
Defined benefit plan contributions 10  
Other Pension Plan    
Retirement Plan Disclosure    
Defined benefit plan contributions 75  
401K [Member]    
Retirement Plan Disclosure    
Defined benefit plan contributions $ 27