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Stock-Based Incentive Compensation Plans (Total unrecognized compensation expense for all stock-based incentive compensation plans) (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] |  |  |
Unrecognized stock-based incentive compensation expense | $ 55 | $ 47 | $ 44
Stock options [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Unrecognized stock-based incentive compensation expense | $ 9 | $ 8 | $ 8
Weighted average period (in years) | 1 year 4 months 24 days | 1 year 4 months 24 days | 1 year 4 months 24 days
Performance Shares [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Unrecognized stock-based incentive compensation expense | $ 12 | $ 12 | $ 11
Weighted average period (in years) | 1 year 2 months 12 days | 1 year 4 months 24 days | 1 year
Non-employee Stock Appreciation Rights [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Unrecognized stock-based incentive compensation expense | $ 2 | $ 2 | $ 1
Weighted average period (in years) | 3 years 2 months 12 days | 3 years 7 months 6 days | 3 years
Restricted Stock Units And Non-Vested Stock [Member] |  |  |
Employee service share-based compensation, aggregate disclosures [Abstract] |  |  |
Unrecognized stock-based incentive compensation expense | $ 32 | $ 25 | $ 24
Weighted average period (in years) | 1 year 1 month 6 days | 1 year 2 months 12 days | 1 year

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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