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Retirement Plans (Details 13) (Other postretirement benefit plan cost [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Other postretirement benefit plan cost [Member]
Net actuarial loss:
Reclassified to earnings from equity	$ (3)
Gains in current year	(5)
Curtailment gain	(5)
Early Retiree Reinsurance Program Subsidy	(2)
Net actuarial loss, pretax	$ (15)

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- Definition

Curtailments recognized in other comprehensive income as a result of being a component of net periodic benefit cost for the period.

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Government subsidy from the Early Retiree Reinsurance Program recognized in other comprehensive income.

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The aggregate net gain (loss) recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.

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