Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of equity awards common stock	26,000,000
Shares available for future awards	18,000,000
Excess tax benefits	$ 1	$ 1	$ 3
Stock options vested during period	1,000,000	1,000,000	1,000,000
Weighted average fair value per share	$ 34.30	$ 34.57	$ 35.07
Unrecognized compensation cost related to stock options expected to be recognized	3.0
Weighted average period for recognizing unrecognized compensation cost	0.82
Compensation expense	1	1	1
Percentage of fair market value being expected purchase price of employee stock purchase plan	95.00%
Maximum percentage limit of base pay for employees for purchasing shares	10.00%
Shares issued under employee stock purchase plan	183,338	178,684	173,350
Shares issued under employee purchase plan, Average price per share	$ 30.69	$ 30.32	$ 29.20
Shares available for future issuance under Employee Stock Purchase Plan	3,600,000
Stock-Based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower payout percentage based on initial grant	0.00%
Upper payout percentage based on initial grant	200.00%
Current accrual percentage based on original grant	100.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period, Minimum	one
Options vesting period, Maximum	10
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period, Minimum	three
Options vesting period	four
Weighted average fair value per share	$ 39.99
Weighted average grant date fair value of granted shares	$ 0.00		$ 30.18
Unrecognized compensation cost related to stock options expected to be recognized	0.7
Weighted average period for recognizing unrecognized compensation cost	0.7
Total intrinsic value of restricted stock units vested	1	3	3
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	four
Weighted average fair value per share	$ 36.99
Weighted average grant date fair value of granted shares	$ 32.03	$ 31.13	$ 30.19
Unrecognized compensation cost related to stock options expected to be recognized	9.0
Weighted average period for recognizing unrecognized compensation cost	1.2
Total intrinsic value of restricted stock units vested	7
Dividend equivalents accrued on stock units	29,817
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower payout percentage based on initial grant	0.00%
Upper payout percentage based on initial grant	200.00%
Weighted average fair value per share	$ 30.60
Weighted average grant date fair value of granted shares	$ 35.33	$ 34.29	$ 36.41
Unrecognized compensation cost related to stock options expected to be recognized	$ 11.0
Weighted average period for recognizing unrecognized compensation cost	1
Dividend equivalents accrued on stock units	42,235

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Lower Payout Percentage Based On Initial Grant

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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The number of shares newly issued during the reporting period under the plan.

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