Share-Based Compensation (Stock Compensation Plans And Options) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost	$ 21,000,000	$ 22,000,000	$ 66,000,000	$ 77,000,000
Maximum term in years for non-qualified and incentive stock options			10
Options Outstanding	66,266		66,266		72,461
Granted Shares			5,288
Exercised Shares			(7,228)
Forfeited and Expired Shares			(4,255)
Options Exercisable	52,372		52,372
Options Outstanding Weighted-Average Exercise Price	$ 15.81		$ 15.81		$ 16.22
Granted Weighted-Average Exercise Price	$ 21.15		$ 21.15
Exercised Weighted-Average Exercise Price	$ 11.49		$ 11.49
Forfeited and Expired Weighted-Average Exercise Price			$ 36.79
Options Exercisable Weighted-Average Exercise Price	$ 15.52		$ 15.52
Options Outstanding Weighted-Average Remaining Contractual Term in Years	4.95		4.95
Options Exercisable Weighted-Average Remaining Contractual Term in Years			4.09
Options Outstanding Aggregate Intrinsic Value	114,629,000		114,629,000
Options Exercisable Aggregate Intrinsic Value	102,861,000		102,861,000
Compensation cost related to stock options	12,000,000	12,000,000	37,000,000	41,000,000
Proceeds from the exercise of stock options	9,000,000	10,000,000	82,000,000	39,000,000
Total intrinsic value of options exercised	3,000,000	9,000,000	71,000,000	41,000,000
Expected volatility	0.00%	49.00%	0.00%
Expected volatility minimum	48.00%		47.00%	48.00%
Expected volatility maximum	49.00%		49.00%	49.00%
Weighted-average volatility	48.00%	49.00%	0.00%	49.00%
Weighted-average volatility, minimum			47.00%
Weighted-average volatility, maximum			48.00%
Years of historical volatility included in cost recent volatility			15
Expected dividends	1.05%	1.15%	1.10%
Expected dividends minimum				1.15%
Expected dividends maximum				1.40%
Risk-free rate	0.00%		0.00%
Risk-free rate minimum	1.00%	1.50%	1.00%	1.50%
Risk-free rate maximum	1.50%	1.90%	2.70%	3.20%
Average risk-free rate	1.50%	1.90%	0.00%
Average risk-free rate minimum			1.50%	1.90%
Average risk-free rate maximum			2.60%	3.20%
Expected term (in years) minimum	5.1	5.1	5.1	5.1
Expected term (in years) maximum	6.7	6.5	6.7	6.5
Pre-vesting departure rate minimum	0.40%	1.40%	0.40%	1.40%
Pre-vesting departure rate maximum	3.90%	3.60%	3.90%	3.60%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable period from date of grant, in years			5
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable period from date of grant, in years			1
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs related to stock options	$ 36,000,000		$ 36,000,000
Weighted-average period to recognize the cost, in years			2

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The weighted average of risk free rates used in the quarter. Risk free rate is defined as the yield of a zero-coupon U.S. Treasury bond whose maturity period equals the option's expected term.

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The maximum weighted average of risk free rates used in the quarter. Risk free rate is defined as the yield of a zero-coupon U.S. Treasury bond whose maturity period equals the option's expected term.

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The minimum weighted average of risk free rates used in the quarter. Risk free rate is defined as the yield of a zero-coupon U.S. Treasury bond whose maturity period equals the option's expected term.

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Share based compensation arrangement by share based payment award fair value assumptions weighted average volatility rate maximum.

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Share based compensation arrangement by share based payment award fair value assumptions weighted average volatility rate minimum.

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The maximum 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 minimum 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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Stock options exercisable period from date of grant.

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Years of Historical Volatility Included in Most Recent Volatility

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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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 aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The maximum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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

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

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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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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Net number of share options (or share units) granted during the period.

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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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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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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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Number of share options (or share units) exercised during the current period.

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