Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	6 Months Ended
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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Percentage Of Shares Awarded Based On Market Performance Achieved Minimum

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Share-based Compensation Arrangements, Performance Metric, Term of award Period

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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