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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions | Sep. 30, 2018 USD ($)
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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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