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Benefit Plans Contributions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Retirement Plan Disclosure
Assets for Plan Benefits, Defined Benefit Plan	$ 7,800	$ 7,800	$ 6,800	$ 8,000
Remaining Employer Contributions		75
Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions		225
defined benefit plan, plan assets, monthly contributions by employer		25
Other Post-retirement Benefits
Retirement Plan Disclosure
Defined benefit plan contributions		19
SERP
Retirement Plan Disclosure
Defined benefit plan contributions	5
Rebates [Member]
Retirement Plan Disclosure
Defined benefit plan contributions		4
401K [Member]
Retirement Plan Disclosure
Defined benefit plan contributions		$ 67
Minimum | Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions	$ 300

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