Share-Based Compensation - Method and Assumptions on Valuation of Stock Options and Awards (Details) - Stock Option Plan - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Share-based Compensation Assumptions [Line Items]
Expected life (in years)	7 years 7 months 20 days	7 years 4 days	6 years 10 months 9 days
Volatility	32.37%	35.00%	35.31%
Risk free interest rate	3.10%	2.14%	1.56%
Dividend yield	0.61%	0.50%	0.67%
Weighted-average fair value at the grant date (in dollars per share)	$ 21.03	$ 21.11	$ 12.83
Expected stock volatility rate, low end of range	31.72%	28.19%	29.20%
Expected stock volatility rate, high end of range	36.73%	35.00%	36.00%
Share-based compensation, unrecognized compensation	$ 84
Share-based compensation, unrecognized compensation weighted-average period of recognition	1 year 2 months 12 days

[Line Items] for Schedule of Share-based Compensation Assumptions [Table]

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

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

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- Definition

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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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