Stock Options and Incentive Plans (Stock Option Activity) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted-Average Exercise Price Outstanding at January 1	$ 71.20
Number of Options Outstanding at January 1	3,428
Number of options granted	625
Weighted-Average Exercise Price Granted	$ 85.46
Number of Options Exercised	(244)
Weighted-Average Exercise Price Exercised	$ 46.63
Number of Options Cancelled or expired	(346)
Weighted-Average Exercise Price Cancelled or expired	$ 120.64
Number of Options Outstanding at December 31	3,463	3,428
Weighted-Average Exercise Price Outstanding at December 31	$ 70.63	$ 71.20
Number of shares exercisable at December 31	2,484
Weighted-Average Exercise Price Exercisable at December 31	$ 73.10
Share-based Compensation [Abstract]
Intrinsic Value	$ 9	$ 40	$ 9
Tax Benefit from Stock Options Exercised	3	14	3
Proceeds from Stock Options Exercised	$ 14	$ 72	$ 21

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified stock options) recognized on the entity's tax return exceeds compensation cost from non-qualified stock options recognized on the income statement. This element increases net cash provided by operating activities.

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