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Benefit Plans Expected Amortization of Regulatory Assets in Next Fiscal Year (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020 USD ($)
Defined Benefit Plan Disclosure
Prior service cost (credit)	$ (115)
Net actuarial loss	459
Defined Benefit Plan Amortization From Regulatory Assets Of Amounts Capitalized due to Actions of Regulatory	28
Pension Benefits
Defined Benefit Plan Disclosure
Prior service cost (credit)	(97)
Net actuarial loss	447
Defined Benefit Plan Amortization From Regulatory Assets Of Amounts Capitalized due to Actions of Regulatory	28
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Prior service cost (credit)	(18)
Net actuarial loss	12
Defined Benefit Plan Amortization From Regulatory Assets Of Amounts Capitalized due to Actions of Regulatory	$ 0