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Stock-Based Incentive Compensation Plans (Compensation Expense By Award Type) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Compensation expense | $ 50 | $ 46 | $ 41
Recognized tax benefit | 18 | 16 | 14
Stock options [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Compensation expense | 10 | 9 | 7
Performance Shares [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Compensation expense | 13 | 11 | 12
Non-employee Stock Appreciation Rights [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Compensation expense | 2 | 3 |
Restricted Stock Units And Non-Vested Stock [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Compensation expense | $ 25 | $ 23 | $ 22

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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