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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions | Sep. 30, 2016 USD ($)
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Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 770 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 771 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 774 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 778 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 780 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 3,876 | [1]
Other Post-retirement Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 35 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 35 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 33 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 32 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 30 |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | $ 132 |
[1] | Participants are assumed to receive the Fixed Fund in a lump sum in lieu of available annuity options allowed for certain grandfathered participants resulting in higher estimated pension benefits payments.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the five rolling twelve months after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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