Share-based Incentive Compensation Plans - Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested	$ 124	$ 99	$ 102
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	26.50%			28.60%
Expected term (in years)	5 years 11 months 26 days			6 months
Strike price (usd per share)	$ 50.03			$ 37.60
Risk-free interest rate	2.70%			2.10%
Expected dividend yield	1.00%			0.11%
Weighted average estimated fair value (usd per share)	$ 13.78			$ 11.89
Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	28.29%	28.58%	26.67%
Average expected volatility of peer companies	25.15%	26.76%	27.43%
Expected term (in years)	2 years 10 months 9 days	2 years 10 months 9 days	2 years 10 months 9 days
Risk-free interest rate	2.48%	2.40%	1.45%
Expected dividend yield	0.00%	0.00%	0.00%
Average correlation coefficient of peer companies	63.00%	67.00%	68.00%

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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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 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

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

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Correlation Coefficient of Peer Companies

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