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Share-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Number of Stock Options
Number of Stock Options, Outstanding at Beginning of period (in shares)			571,380
Number of Stock Options, Exercised (in shares)	(11,953)	(40,160)	(99,953)	(1,074,321)
Number of Stock Options, Forfeited (in shares)			(3,182)
Number of Stock Options, Outstanding at End of period (in shares)	468,245		468,245		571,380
Stock options, exercisable (in shares)	289,033	300,000	289,033	300,000
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Outstanding at Beginning of period (in dollars per share)			$ 43.84
Weighted-Average Exercise Price, Exercised (in dollars per share)			24.52
Weighted-Average Exercise Price, Forfeited (in dollars per share)			26.86
Weighted-Average Exercise Price, Outstanding at End of period (in dollars per share)	$ 48.08		48.08		$ 43.84
Options exercisable, weighted average exercise price (in dollars per share)	$ 36.55	$ 23.77	$ 36.55	$ 23.77
Weighted-Average Remaining Contractual Term (in years)			5 years 5 months 22 days		5 years 4 months 25 days
Weighted-Average Remaining Contractual Term, Exercisable (in years)			3 years 10 months
Aggregate Intrinsic Value (in millions)	$ 18		$ 18		$ 19
Aggregate Intrinsic Value, Exercisable (in millions)	$ 14		$ 14

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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