Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 81
Cost expected to be recognized, weighted average period (in years)	3 years 7 months
Market Based Restricted Stock [Member] [Member]
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
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	$ 57.24
Method used for calculation of performance of share	Monte Carlo
Weighted average stock price volatility	19.90%
Expected term (in years)	3 years
Risk free interest rate	2.01%
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	$ 44.48
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate market value of shares released and issued \| $	$ 16
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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Percentage Of Shares Awarded Based On Market Performance Achieved Minimum

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Unrecognized cost of unvested share-based compensation awards.

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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.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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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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Weighted average expected volatility rate of share-based compensation awards.

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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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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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