Stock Options and Other Stock Based Compensation (Details 2) (Stock Options, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options
Number of Shares
Options outstanding, Beginning balance (in shares)	2,421
Granted (in shares)	346
Exercised (in shares)	(231)
Forfeited or expired (in shares)	(115)
Options outstanding, ending balance (in shares)	2,421	2,421
Options vested or expected to vest (in shares)	2,389
Options exercisable (in shares)	1,595
Weighted Average Exercise Price (per share)
Options outstanding, Beginning balance (in dollars per share)	$ 25.50
Granted (in dollars per share)	$ 33.38
Exercised (in dollars per share)	$ 21.43
Forfeited or expired (in dollars per share)	$ 29.43
Options outstanding, Closing balance (in dollars per share)	$ 26.83	$ 25.50
Options vested or expected to vest (in dollars per share)	$ 26.80
Options exercisable (in dollars per share)	$ 24.14
Weighted Average Remaining Contractual Term (in years)
Options outstanding, Closing balance	3 years 1 month 6 days
Options vested or expected to vest	3 years
Options exercisable	2 years
Aggregate Intrinsic Value
Options outstanding, Closing balance (in dollars)	$ 12
Options vested or expected to vest (in dollars)	12
Options exercisable (in dollars)	11
Weighted average grant-date fair value of options granted (in dollars per share)	$ 13.17	$ 12.39	$ 10.63
Aggregate intrinsic value of options exercised (in dollars)	3	16	3
Aggregate cash received from options exercised (in dollars)	$ 5	$ 24	$ 4
Weighted average assumptions used to estimate the fair value of each option grant
Expected life of options (years)	5 years	5 years	4 years 9 months
Expected stock price volatility (as a percent)	43.00%	55.30%	56.60%
Risk-free interest rate (as a percent)	1.60%	0.90%	0.80%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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 option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average expected volatility rate of share-based compensation awards.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average price of options that were either forfeited or expired.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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