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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions	Sep. 30, 2018 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 779
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	776
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	772
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	771
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	768
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	3,771
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	23
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 109

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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
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-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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