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Benefit Plans Components of Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Pension Plan        
Retirement Plan Disclosure        
Service cost $ 8 $ 8 $ 16 $ 15
Interest cost 132 145 263 289
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (127) 123 (253) 247
Amortization of prior service cost (23) (23) (45) (45)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 45 (25) 87 (50)
Net periodic benefit cost as acutarially determined 35 32 68 62
Other Postretirement Benefit Plan        
Retirement Plan Disclosure        
Service cost 3 2 6 5
Interest cost 5 6 9 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) 0 (1) 0 0
Net periodic benefit cost as acutarially determined $ 3 $ 4 6 $ 7
Defined benefit plan contributions     13  
Other Pension Plan        
Retirement Plan Disclosure        
Defined benefit plan contributions     150  
401K [Member]        
Retirement Plan Disclosure        
Defined benefit plan contributions     $ 66