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Share-Based Compensation (Summary of Unrecognized Compensation Cost And Weighted Average Period For Recognition) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($)
Restricted Stock Awards And Units [Member] |
Unrecognized Compensation And Weighted Average Recognition [Line Items] |
Unrecognized compensation cost | $ 116
Weighted average period for recognition (years) | 2 years 9 months 18 days
Performance-Based Restricted Stock Awards [Member] |
Unrecognized Compensation And Weighted Average Recognition [Line Items] |
Weighted average period for recognition (years) | 1 year 10 months 24 days
Performance Share Units [Member] |
Unrecognized Compensation And Weighted Average Recognition [Line Items] |
Unrecognized compensation cost | $ 25
Weighted average period for recognition (years) | 1 year 8 months 12 days

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- Definition Unrecognized Compensation And Weighted Average Recognition [Line Items] + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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