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Pension Plans Pension and Postretirement Plans (Deferred Compensation) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Deferred compensation plans obligations	$ 70	$ 71

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- References

No definition available.

+ Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements other than those specified elsewhere in the taxonomy.

+ References

No definition available.

+ Details

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