Stock-Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2011 Y	Dec. 31, 2010 Y	Dec. 31, 2009 Y
Option issue
Average option life	6.2	6.1	6.0
Future dividend yield	0.43%	0.48%	0.72%
Historical share price volatility	0.479%	0.473%	0.46%
Weighted-average risk-free interest rate	2.60%	2.20%	3.00%
Activity, pricing and other information for stock options
Outstanding at December 31, 2010, Number of Option	32,982,923
Outstanding at December 31, 2010, Weighted-Average Exercise Price Per Option	$ 22.97
Granted Number of Options	3,683,051
Granted Weighted Average Exercise Price Per Option	$ 8.87
Number of Options, Exercised	(121,089)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 5.55
Lapsed or canceled Number of Options	(3,612,267)
Lapsed or canceled Weighted Average Exercise Price Per Option	$ 26.27
Outstanding at December 31, 2011, Number of Option	32,932,618	32,982,923
Outstanding at December 31, 2011, Weighted-Average Exercise Price Per Option	$ 21.12	$ 22.97
Outstanding at December 31, 2011, Weighted Average Remaining Life (Years)	5.0
Outstanding at December 31, 2011, Aggregate Intrinsic Value	$ 8
Expected to vest, Number of Options	5,747,983
Expected to vest, Weighted-Average Exercise Price Per Option	$ 8.29
Expected to vest Weighted-Average Remaining Life (Years)	8.7
Expected to vest Aggregate Intrinsic Value	2
Exercisable at December 31, 2011, Number of Options	26,456,386
Exercisable at December 31, 2011, Weighted-Average Exercise Price Per Option	$ 24.25
Exercisable at December 31, 2011, Weighted-Average Remaining Life (Years)	4.1
Exercisable at December 31, 2011, Aggregate Intrinsic Value	$ 7
Long-Term Incentive Compensation Program [Member]
Activity and pricing information for nonvested shares in deferred compensation plans
Weighted-Average Grant Date Fair Value, Granted	$ 9.12	$ 6.74	6.56
Long-Term Incentive Compensation Program [Member] \| Vesting Contingent on Service Conditions [Member]
Activity and pricing information for nonvested shares in deferred compensation plans
Outstanding at December 31, 2010, Number of Nonvested Shares	1,594,104
Outstanding at December 31, 2010, Weighted-Average Grant-Date Fair Value	$ 10.32
Number of Nonvested Shares, Granted	3,321,443
Weighted-Average Grant Date Fair Value, Granted	$ 9.23
Number of Nonvested Shares, Vested	(359,472)
Weighted Average Grant-Date Fair Value, Vested	$ 22.58
Number of Nonvested Shares, Forfeited	(232,104)
Weighted Average Grant-Date Fair Value, Forfeited	$ 8.40
Outstanding at December 31, 2011, Number of Nonvested Shares	4,323,971
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value	$ 8.57
Long-Term Incentive Compensation Program [Member] \| Vesting Contingent on Performance and Service Conditions [Member]
Activity and pricing information for nonvested shares in deferred compensation plans
Outstanding at December 31, 2010, Number of Nonvested Shares	1,892,176
Outstanding at December 31, 2010, Weighted-Average Grant-Date Fair Value	$ 8.76
Number of Nonvested Shares, Granted	1,061,987
Weighted-Average Grant Date Fair Value, Granted	$ 8.79
Number of Nonvested Shares, Vested	(365,449)
Weighted Average Grant-Date Fair Value, Vested	$ 5.36
Number of Nonvested Shares, Forfeited	(1,526,727)
Weighted Average Grant-Date Fair Value, Forfeited	$ 8.76
Outstanding at December 31, 2011, Number of Nonvested Shares	1,061,987
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value	$ 8.78
Other Restricted Stock Awards [Member]
Activity and pricing information for nonvested shares in deferred compensation plans
Outstanding at December 31, 2010, Number of Nonvested Shares	5,461,855
Outstanding at December 31, 2010, Weighted-Average Grant-Date Fair Value	$ 9.06
Number of Nonvested Shares, Granted	937,419
Weighted-Average Grant Date Fair Value, Granted	$ 9.25	$ 6.96	6.44
Number of Nonvested Shares, Vested	(2,540,615)
Weighted Average Grant-Date Fair Value, Vested	$ 11.3
Number of Nonvested Shares, Forfeited	(171,875)
Weighted Average Grant-Date Fair Value, Forfeited	$ 8.71
Outstanding at December 31, 2011, Number of Nonvested Shares	3,686,784	5,461,855
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value	$ 7.58	$ 9.06
Deferred Compensation Plans [Member]
Activity and pricing information for nonvested shares in deferred compensation plans
Outstanding at December 31, 2010, Number of Nonvested Shares	890,939
Outstanding at December 31, 2010, Weighted-Average Grant-Date Fair Value	$ 8.00
Number of Nonvested Shares, Granted	1,104,820
Weighted-Average Grant Date Fair Value, Granted	$ 8.03	$ 7.93	6.83
Number of Nonvested Shares, Dividend Equivalents	52,724
Weighted-Average Grant Date Fair Value, Dividend Equivalents	$ 7.29
Number of Nonvested Shares, Vested	(655,981)
Weighted Average Grant-Date Fair Value, Vested	$ 8.73
Number of Nonvested Shares, Forfeited	(54,177)
Weighted Average Grant-Date Fair Value, Forfeited	$ 7.97
Outstanding at December 31, 2011, Number of Nonvested Shares	1,338,325	890,939
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value	$ 7.64	$ 8.00

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Share based compensation arrangement by share based payment awards equity instruments other than options dividend equivalents.

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Share based compensation arrangement by share based payment awards equity instruments other than options forfeited in period weighted average grant date fair value.

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Share based compensation arrangement by share based payment awards options exercisable intrinsic value.

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Share based compensation arrangement by share based payment awards options grants in period weighted average exercise price.

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Share based compensation arrangement by share based payment awards options vested and expected to vest weighted average remaining contractual term.

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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

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The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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 decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option 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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No definition available.

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For presentations that combine terminations, the weighted average price of expired options and the price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period .

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The quantity of shares issuable on stock options awarded under the plan during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

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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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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 that are exercisable.

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

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the expected term of a nonvested share or option award issued to other than an employee.

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The estimated measure of the percentage amount by which a share price is expected to fluctuate during the expected term of a nonvested share or option award issued to other than an employee.

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