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Share-Based Compensation (Summary of Stock Option Activity, Outstanding and Exercisable) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Stock Options
Outstanding, number of stock options (in shares) | shares	447,716
Outstanding, weighted-average remaining contractual term	5 years 6 months 6 days
Outstanding, weighted-average exercise price (in dollars per share)	$ 49.19
Outstanding, aggregate intrinsic value | $	$ 15
Exercisable, number of exercisable (in shares) | shares	268,504
Exercisable, weighted-average remaining contractual term	3 years 10 months 10 days
Exercisable, weighted-average exercise price (in dollars per share)	$ 37.51
Exercisable, aggregate intrinsic value | $	$ 12
Exercise Price Range One
Stock Options
Outstanding, number of stock options (in shares) | shares	76,844
Outstanding, weighted-average remaining contractual term	1 year 1 month 30 days
Outstanding, weighted-average exercise price (in dollars per share)	$ 19.74
Outstanding, aggregate intrinsic value | $	$ 5
Exercisable, number of exercisable (in shares) | shares	76,844
Exercisable, weighted-average remaining contractual term	1 year 1 month 30 days
Exercisable, weighted-average exercise price (in dollars per share)	$ 19.74
Exercisable, aggregate intrinsic value | $	$ 5
Exercise Price Range Two
Stock Options
Outstanding, number of stock options (in shares) | shares	370,872
Outstanding, weighted-average remaining contractual term	6 years 5 months 2 days
Outstanding, weighted-average exercise price (in dollars per share)	$ 55.29
Outstanding, aggregate intrinsic value | $	$ 10
Exercisable, number of exercisable (in shares) | shares	191,660
Exercisable, weighted-average remaining contractual term	4 years 11 months 10 days
Exercisable, weighted-average exercise price (in dollars per share)	$ 44.64
Exercisable, aggregate intrinsic value | $	$ 7
Minimum | Exercise Price Range One
Stock Options
Range of exercise price, lower range limit (in dollars per share)	$ 18.67
Minimum | Exercise Price Range Two
Stock Options
Range of exercise price, lower range limit (in dollars per share)	25.28
Maximum | Exercise Price Range One
Stock Options
Range of exercise price, lower range limit (in dollars per share)	20.1
Maximum | Exercise Price Range Two
Stock Options
Range of exercise price, lower range limit (in dollars per share)	$ 66.68

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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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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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