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Benefit Plans Contributions (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2021
Retirement Plan Disclosure
Remaining Employer Contributions		$ 150
Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions		150
defined benefit plan, plan assets, monthly contributions by employer		25
Other Post-retirement Benefits
Retirement Plan Disclosure
Defined benefit plan contributions		13
SERP
Retirement Plan Disclosure
Defined benefit plan contributions	$ 5
Rebates [Member]
Retirement Plan Disclosure
Defined benefit plan contributions		1
401K [Member]
Retirement Plan Disclosure
Defined benefit plan contributions		$ 48
Minimum | Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions	$ 300

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