Retirement Plans (Schedule of Funded Status and Components of the Amounts Recognized in the Consolidated Balance Sheets and in Accumulated Other Comprehensive Gain (Loss), Before the Effect of Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair value of plan assets	$ 210	$ 200
Benefit obligations	316	308
Funded status	(106)	(108)
Current liabilities—Accrued compensation	(1)	(1)
Noncurrent liabilities—Other liabilities	(105)	(107)
Unrecognized net actuarial loss	(68)	(61)
Unrecognized prior service cost	12
Accumulated other comprehensive gain (loss) pretax	$ (56)	$ (61)

Retirement Plans (Schedule of Funded Status and Components of the Amounts Recognized in the Consolidated Balance Sheets and in Accumulated Other Comprehensive Gain (Loss), Before the Effect of Income Taxes) (Details) (USD $)
In Millions, unless otherwise specified

Dec. 31, 2011

Dec. 31, 2010

$ 210

$ 200

Benefit obligations

316

308

Funded status

(106)

(108)

Current liabilities—Accrued compensation

(1)

Noncurrent liabilities—Other liabilities

(105)

(107)

Unrecognized net actuarial loss

(68)

(61)

Unrecognized prior service cost

Accumulated other comprehensive gain (loss) pretax

$ (56)

$ (61)

- Definition

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.

+ References+ Details

- Definition

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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+ Details

- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References+ Details

- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References+ Details

- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

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