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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions	Sep. 30, 2015 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 741
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	744
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	748
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	755
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	764
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	3,903
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	39
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	39
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	39
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	39
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	39
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 178

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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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- 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.

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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.

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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.

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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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