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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Pension Benefits      
Defined Benefit Plan Disclosure      
Service cost $ 53 $ 57 $ 55
DefinedBenefitPlanNetPeriodicBenefitCostCreditInterestCostStatementOfIncome 378 368 415
DefinedBenefitPlanNetPeriodicBenefitCostCreditExpectedReturnLossStatementOfIncome (435) (493) (488)
DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfPriorServiceCostCreditStatementOfIncome (93) (97) (97)
DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfGainLossStatementOfIncome 392 452 436
Net periodic benefit cost as acutarially determined 295 287 321
Amount expensed (capitalized) due to actions of regulator (13) (19) 15
Total net period benefit cost 308 306 306
Other Post-retirement Benefits      
Defined Benefit Plan Disclosure      
Service cost 17 18 16
DefinedBenefitPlanNetPeriodicBenefitCostCreditInterestCostStatementOfIncome 15 16 16
Expected return on plan assets 0 0 0
DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfPriorServiceCostCreditStatementOfIncome (17) (18) (24)
DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfGainLossStatementOfIncome 5 (11) (10)
Net periodic benefit cost as acutarially determined 20 27 18
Amount expensed (capitalized) due to actions of regulator 0 0 0
Total net period benefit cost $ 20 $ 27 $ 18