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Retirement Plans (Details 12) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Net Periodic Benefit Cost that are not yet recognized
Tax impact	$ (233)	$ (226)
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Net of Tax, Total	481	464
Other postretirement benefit plan cost [Member]
Net Periodic Benefit Cost that are not yet recognized
Net actuarial loss	35	50
Total, pretax effect	35	50
Tax impact	(13)	(19)
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Net of Tax, Total	$ 22	$ 31

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Tax effects on the accumulated comprehensive income (loss) related to benefit plans.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes 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.

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