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Stock-Based Incentive Compensation Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock Units [Member] |  |  |
Narrative [Abstract] |  |  |
Percentage of total awards granted during the year for participating executive officers | 42.00% | 40.00% | 41.00%
Stock awards granted (in shares) | 448,527 | 767,733 | 481,900
Performance Shares [Member] |  |  |
Narrative [Abstract] |  |  |
Percentage of total awards granted during the year for participating executive officers | 35.00% | 36.00% | 35.00%
Percentage of target award opportunities, minimum | 0.00% | 0.00% | 0.00%
Percentage of target award opportunities, maximum | 200.00% | 200.00% | 200.00%
Stock awards granted (in shares) | 154,351 | 291,298 | 161,255
Stock options with performance conditions [Member] |  |  |
Narrative [Abstract] |  |  |
Option awards granted (in shares) | 102,728 |  |
Total fair value of options vested | $ 2 | $ 1 | $ 1
Total intrinsic value of options exercised | $ 12 | $ 3 | $ 2
Stock options with service conditions [Member] |  |  |
Narrative [Abstract] |  |  |
Percentage of total awards granted during the year for participating executive officers | 23.00% | 24.00% | 24.00%
Maximum Contractual Term (In Years) | 10 years | 10 years | 10 years
Vesting period (in years) | 3 years | 3 years | 3 years
Option awards granted (in shares) | 407,637 | 776,895 | 502,664
Total fair value of options vested | $ 6 | $ 6 | $ 7
Total intrinsic value of options exercised | $ 23 | 22 | 25
Non-employee Stock Appreciation Rights [Member] |  |  |
Narrative [Abstract] |  |  |
Vesting period (in years) | 4 years |  |
Percentage of SARs vesting each year over four-year period | 25.00% |  |
Option awards granted (in shares) | 26,494 |  |
SARs liability | $ 3 | 4 |
Payment for SARs exercised | $ 3 | $ 2 | $ 2

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- Definition The maximum percentage of target award opportunities that may be paid out in shares, cash or a combination of shares and cash, depending on performance results. + References No definition available. + Details
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- Definition The minimum percentage of target award opportunities that may be paid out in shares, cash or a combination of shares and cash, depending on performance results. + References No definition available. + Details
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- Definition Percentage of the total awards granted during the year, by award type, for participating executive officers. + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + References No definition available. + Details
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- Definition The total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service or performance requirements, to receive or retain shares, options, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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