Number of shares of company stock held in the rabbi trust attributable to a member of the board of directors.

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Percentage of shares of company stock held in the rabbi trust attributable to a member of the board of directors.

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The amount of distributions to rabbi trust participants.

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The number of company shares sold by plan participants in the rabbi trust.

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The decreases to net income related to deferred compensation gains on common stock held in a rabbi trust.

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Period of time over which remaining shares held in deferred compensation plan are expected to be distributed.

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Duration of time for our expected dividends to be used in the calculation of our dividend yield.

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Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability

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Reflects the dating as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, in years, month and year).

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No definition available.

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The period of time during which a range of company stock prices is used to calculate an average stock price.

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The maximum term to maturity on US Treasuries used within the option valuation model to approximate a risk-free rate assumption. The risk-free rate is the implied yield on US Treasury securities with remaining term equal to the expected term of the option.

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The minimum term to maturity on US Treasuries used within the option valuation model to approximate a risk free rate assumption. The risk-free rate is the implied yield on US Treasury securities with remaining term equal to the expected term of the option.

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Maximum range number of shares approved, net of any subsequent amendments and adjustments, for awards under share-based compensation plans.

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Share-based Compensation Arrangement By Share-based Payment Award, Maximum Number Of Times Fair Market Value Of Award Issued

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Price per share of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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No definition available.

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Aggregate number of common shares reserved for future issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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No definition available.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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No definition available.

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

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit 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 or units.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of share instruments newly issued under a share-based compensation plan.

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Stock-Based and Other Compensation Plans - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 01, 2016 simulation $ / shares shares	Dec. 31, 2017 USD ($) simulation $ / shares shares	Dec. 31, 2016 USD ($) simulation $ / shares shares	Dec. 31, 2015 USD ($) simulation $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percent of employees' gross pay		6.00%
401K Plan Employer Cash Contributions \| $		$ 31	$ 32	$ 35
Shares of common stock held by rabbi trust (in dollars per share) \| $ / shares		$ 16.72
Deferred compensation arrangement most shares held by individual \| shares		400,000
Deferred compensation arrangement, percent of the most shares held by individual		85.00%
Deferred compensation distribution timeline		2 years
Deferred compensation arrangement plan, distribution amount \| shares		200,000	200,000	200,000
Deferred compensation arrangement shares sold \| shares		1,238	1,009	1,009
Deferred compensation arrangements trust plan, distribution amount \| $		$ 21	$ 22	$ 18
Deferred compensation (income) expense \| $		9	11	(12)
Deferred compensation liabilities \| $		$ 116	121
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options		5 years
Maximum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options		7 years
The period ended, prior to the date of grant, over which an average of daily stock prices is computed in determining the dividend yield		3 years
Duration of dividends		1 year
Total intrinsic value of options exercised \| $		$ 4	$ 10	$ 7
Unrecognized compensation cost related to nonvested awards \| $		$ 21
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)		1 year 3 months 18 days
Expected volatility (in hundredths)		33.20%	32.40%	32.60%
Risk-free rate (in hundredths)		2.20%	1.60%	1.40%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested awards \| $		$ 41
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)		1 year 4 months 24 days
Total fair value of vested restricted stock \| $		$ 34	$ 24	$ 62
Weighted average award date fair value, shares awarded (in dollars per share) \| $ / shares		$ 35.45	$ 29.99	$ 35.53
Number of Simulations \| simulation		500,000	500,000	500,000
Expected volatility (in hundredths)		35.00%	38.00%	30.00%
Risk-free rate (in hundredths)		1.50%	1.00%	0.80%
Restricted Stock \| Subject to Time Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average award date fair value, shares awarded (in dollars per share) \| $ / shares		$ 36.26
Weighted average award date fair value (in dollars per share) \| $ / shares		$ 37.21	$ 36.37
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested awards \| $		$ 6
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)		1 year 1 month 6 days
Phantom Share Units (PSUs) \| Subject to Time Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average award date fair value (in dollars per share) \| $ / shares		$ 31.65	$ 31.65
2017 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares) \| shares		29,000,000
Number of shares of common stock reserved for issuance (in shares) \| shares		28,987,609
Shares of common stock available for future grants and awards (in shares) \| shares		28,972,832
Expiration period (in years)		10 years
Stock option vesting period		3 years
2017 Long-Term Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period		2 years
2017 Long-Term Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period		3 years
2015 Stock Plan for Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares) \| shares		708,996
Number of shares of common stock reserved for issuance (in shares) \| shares		674,025
Shares of common stock available for future grants and awards (in shares) \| shares		463,096
Stock Option And Restricted Stock Plan 1992 \| Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period	3 years
Issued (shares) \| shares	1,000,000
Number of Simulations \| simulation	500,000
Expected volatility (in hundredths)	3800.00%
Risk-free rate (in hundredths)	90.00%
Maximum number of times fair market value of stock price of award issued	400.00%
Weighted average award date fair value (in dollars per share) \| $ / shares	$ 31.65
Officer \| Stock Option And Restricted Stock Plan 1992 \| Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option vesting period	2 years
Fair Value, Measurements, Recurring
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation liability \| $		$ 10	$ 9