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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions	Sep. 30, 2019 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 782
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	779
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	778
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	775
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	771
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	3,786
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	29
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	27
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	25
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	24
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	22
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 111

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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