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Retirement Plans (Details 18) (Other postretirement benefit plan cost [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Other postretirement benefit plan cost [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Abstract]
2012	$ 22
2013	23
2014	23
2015	23
2016	24
2017-2021	$ 118

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The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position).

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The amount of the benefits expected to be paid in Year 5.

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The amount of the benefits expected to be paid in Year 4.

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The amount of the benefits expected to be paid in Year 1.

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-Number 132R

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The amount of the benefits expected to be paid in Year 3.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The amount of the benefits expected to be paid in Year 2.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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