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Stock-Based Compensation (Schedule of Unrecognized Compensation Costs and Amortization Periods) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award |
Stock options | $ 11
Weighted-Average Service Years | 1 year 3 months 18 days
Restricted share units |
Share-based Compensation Arrangement by Share-based Payment Award |
Total remaining unrecognized compensation costs, nonvested awards other than options | $ 10
Weighted-Average Service Years | 1 year 7 months 6 days
Performance-based restricted share units |
Share-based Compensation Arrangement by Share-based Payment Award |
Total remaining unrecognized compensation costs, nonvested awards other than options | $ 48
Weighted-Average Service Years | 2 years

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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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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 Unrecognized cost of unvested options awarded to employees as compensation. + 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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