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Benefit Plans Estimated Future Benefit Payments (Details)
$ in Millions
Sep. 30, 2022
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months $ 793
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 808
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 813
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 810
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 807
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 3,932
Other Post-retirement Benefits  
Defined Benefit Plan Disclosure  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 22
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 21
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 21
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 21
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 22
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 126