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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions	Sep. 30, 2016 USD ($)
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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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.

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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.

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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.

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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.

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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.

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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.

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