Maximum Performance Based RSU Target Performance Conditions Exceeded For Awards Granted during or after 2014

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- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested and expected to vest, outstanding, number.

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Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested and expected to vest, weighted average grant date fair value.

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No definition available.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made 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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- Definition

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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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

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SHARE-BASED COMPENSATION - RSAs AND RSUs (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			60 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Maximum Performance Based RSU Target Performance Conditions Exceeded For Awards Granted during or after 2014	100.00%			100.00%
Share-Based Compensation, Restricted Stock Awards And Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free rate of return	2.00%	1.50%	1.30%
Stock price volatility	17.00%	17.00%	16.00%
Share-Based Compensation, Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Equity instruments other than options, vested in the period, fair value	$ 32	$ 45	$ 46
Nonvested awards, compensation cost not yet recognized	$ 24			$ 24
Weighted average period over which unrecognized compensation cost will be recognized	1 year 9 months 18 days
Share-Based Compensation, Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)				0
Equity instruments other than options, vested in the period, fair value			$ 0
Share-Based Compensation, Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)	1,701,617
Granted (in shares)	358,363
Vested (in shares)	(157,745)
Forfeited (in shares)	(660,066)
Nonvested, end of period (in shares)	1,242,169	1,701,617		1,242,169
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 105.84
Weighted average grant date fair value, granted (in dollars per share)	105.03	$ 110.54	$ 100.37
Weighted average grant date fair value, vested (in dollars per share)	99.42
Weighted average grant date fair value, forfeited (in dollars per share)	106.45
Weighted average grant date fair value, end of period (in dollars per share)	$ 106.11	$ 105.84		$ 106.11
Expected to vest (in shares)	1,211,529			1,211,529
Weighted average grant date fair value, expected to vest (in dollars per share)	$ 105.47			$ 105.47
Share-Based Compensation, Service Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)	285,895
Granted (in shares)	288,474
Vested (in shares)	(163,609)
Forfeited (in shares)	(8,399)
Nonvested, end of period (in shares)	402,361	285,895		402,361
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 98.81
Weighted average grant date fair value, granted (in dollars per share)	107.60	$ 101.88	$ 93.59
Weighted average grant date fair value, vested (in dollars per share)	100.60
Weighted average grant date fair value, forfeited (in dollars per share)	103.32
Weighted average grant date fair value, end of period (in dollars per share)	$ 105.01	$ 98.81		$ 105.01
Expected to vest (in shares)	396,358			396,358
Weighted average grant date fair value, expected to vest (in dollars per share)	$ 104.26			$ 104.26