STOCK-BASED COMPENSATION PLANS - RSUS (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement Impact From RSUs [Abstract]
Share-based compensation expense	$ 175	$ 176	$ 176
2016 Plan [Member] \| Stock Options [Member]
Restricted Stock Units [Line Items]
Nonvested options recognized over weighted average period, years	2 years 4 months
Unrecognized compensation on nonvested stock options	$ 89
Income Statement Impact From RSUs [Abstract]
Share-based compensation expense	64	79	87
Future income tax benefit recognized	$ 13	$ 17	$ 29
2016 Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Restricted Stock Units [Line Items]
Nonvested options recognized over weighted average period, years	3 years 2 months
Unrecognized compensation on nonvested stock options	$ 218
Restricted Stock Units Number of Options [Abstract]
Non-vested at beginning of period,	3,946,827	4,467,343	4,981,588
Spin related adjustment	154,346
Granted	1,360,338	1,274,791	1,364,469
Vested	(988,787)	(1,289,892)	(1,486,173)
Forfeited	(814,851)	(505,415)	(392,541)
Non-vested at end of period,	3,657,873	3,946,827	4,467,343
Weighted average grant date fair value per share [Abstract]
Non-vested at beginning of period,	$ 108.6	$ 94.17	$ 82.18
Granted	153.46	129.71	110.49
Vested	91.68	81.37	68.58
Forfeited	117.4	103.06	88.88
Non-vested at end of period,	$ 125.35	$ 108.6	$ 94.17
Income Statement Impact From RSUs [Abstract]
Share-based compensation expense	$ 111	$ 97	$ 97
Future income tax benefit recognized	$ 21	$ 19	$ 30

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The number of spin related adjustments 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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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Unrecognized cost of unvested share-based compensation awards.

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

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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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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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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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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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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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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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