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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation cost | $ | $ 74
Cost expected to be recognized, weighted average period (in years) | 2 years 11 months 1 day
Performance-Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period for shares awarded (in years) | 3 years
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 72.08
Weighted average stock price volatility | 22.00%
Expected term (in years) | 3 years
Risk free interest rate | 1.60%
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 | $ 69.71
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Aggregate market value of shares released and issued | $ | $ 22
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
Performance Metric, Market Conditions, Total shareholder Returns | Performance-Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Performance metric, term of award period | 3 years
Cliff vesting period | 3 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%
Performance Metric, Average Return on Invested Capital | Performance-Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Performance metric, term of award period | 3 years
Cliff vesting period | 3 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%

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