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Benefit Plans Estimated Future Benefit Payments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 712
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	715
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	720
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	724
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	731
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	3,759
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	40
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	41
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	41
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	41
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 186

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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.

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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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No definition available.

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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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No definition available.

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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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No definition available.

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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.

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No definition available.

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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.

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No definition available.

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