Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Share-Based Compensation Share-Based Compensation - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Restricted stock	Mar. 31, 2014 Restricted stock Minimum	Mar. 31, 2014 Stock Options	Mar. 31, 2014 Year of 2012 [Member] Performance Shares [Member]	Mar. 31, 2013 Year of 2012 [Member] Performance Shares [Member]	Mar. 31, 2014 Management [Member] Retention Based Stock Option Award [Member]	Mar. 31, 2014 Management [Member] Incentive Based Stock Option Award [Member]	Mar. 31, 2014 Management [Member] Stock Options	Mar. 31, 2014 Share-Based Comp Award One Year Anniversary [Member] Management [Member] Year of 2012 [Member] Performance Shares [Member]	Mar. 31, 2014 Share-Based Comp Award Two Year Anniversary [Member] Management [Member] Year of 2012 [Member] Performance Shares [Member]	Mar. 31, 2014 Share-Based Comp Award Three Year Anniversary [Member] Management [Member] Year of 2012 [Member] Performance Shares [Member]	Mar. 31, 2013 Share-Based Comp Award Three Year Anniversary [Member] Management [Member] Years of 2013 and 2014 [Member] Performance Shares [Member]	Mar. 31, 2014 Stock Option Award Three Year Anniversary [Member] Management [Member] Retention Based Stock Option Award [Member]	Mar. 31, 2014 Stock Optioin Award Four Year Anniversary [Member] Management [Member] Retention Based Stock Option Award [Member]	Mar. 31, 2014 Stock option Award Five Year Anniversary [Member] Management [Member] Retention Based Stock Option Award [Member]	Mar. 31, 2013 Long-Term Incentive Plan [Member] Year of 2014 [Member] Performance Shares [Member] TSR is less than zero [Member]	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2012 [Member] Performance Shares [Member] Minimum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2012 [Member] Performance Shares [Member] Maximum	Mar. 31, 2013 Long-Term Incentive Plan [Member] Management [Member] Year of 2012 [Member] Performance Shares [Member] Maximum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2013 [Member] Performance Shares [Member] Maximum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2013 [Member] TSR [Member] Minimum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2013 [Member] TSR [Member] Maximum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2013 [Member] Operational Component [Member] Minimum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2013 [Member] Operational Component [Member] Maximum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2014 [Member] Performance Shares [Member] Minimum	Mar. 31, 2014 Long-Term Incentive Plan [Member] Management [Member] Year of 2014 [Member] Performance Shares [Member] Maximum	Mar. 30, 2014 Paid-In Capital	Mar. 30, 2013 Paid-In Capital	Mar. 30, 2014 Paid-In Capital Restricted stock	Mar. 30, 2013 Paid-In Capital Restricted stock	Mar. 30, 2014 Paid-In Capital Stock Options	Mar. 31, 2013 Paid-In Capital Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years					3 years		1 year	2 years	3 years		3 years	4 years	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights											first	second	third	third
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value			$ 62
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 6 months		2 years 4 months 26 days
Tax benefit (reduction in tax benefit) from stock-based compensation																													3	(10)	3	10	0	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			255
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period										10 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options					21
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								33.00%										100.00%	0.00%	125.00%	250.00%	200.00%	0.00%	125.00%	0.00%	62.50%	0.00%	200.00%
Allocated Share-based Compensation Expense	$ 0	$ 11				$ 11	$ 2