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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation cost | $ | $ 75
Cost expected to be recognized, weighted average period (in years) | 3 years 1 month 6 days
Market Based Restricted Stock [Member] [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Level of market performance achieved based on shares awarded, minimum (as a percent) | 0.00%
Level of market performance achieved based on shares awarded, maximum (as a percent) | 200.00%
Vesting period for shares awarded (in years) | 3 years
Performance-Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award term | cliff vest at the end of three years
Level of market performance achieved based on shares awarded, minimum (as a percent) | 0.00%
Level of market performance achieved based on shares awarded, maximum (as a percent) | 200.00%
Vesting period for shares awarded (in years) | 3 years
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 46.08
Method used for calculation of performance of share | Monte Carlo
Weighted average stock price volatility | 21.40%
Expected term (in years) | 3 years
Risk free interest rate | 2.45%
Time Vested Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 52.55
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Aggregate market value of shares released and issued | $ | $ 7
Minimum | Time Vested Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period for shares awarded (in years) | 3 years
Maximum | Time Vested Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period for shares awarded (in years) | 5 years

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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