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SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Tax benefit related to share-based compensation costs			$ 6	$ 20
Restricted Stock Units (RSUs)
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Share based compensation costs incurred	$ 15	$ 13	45	57
Tax benefit related to share-based compensation costs	3	3		7
Fair value - vested during period			47	125
Unrecognized compensation costs	106	99	$ 106	99
Unrecognized compensation costs - weighted average period expected to be recognized			2 years 7 months
Restricted Stock Units (RSUs) | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Liability for cash-settled restricted stock units	$ 19	$ 18	$ 19	$ 18
Performance Vesting Restricted Stock Units | Share Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)			230
Granted (in shares)			104
Vested (in shares)			(87)
Forfeited (in shares)			0
Nonvested restricted stock units - end of period (in shares)	247		247
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)			$ 57.08
Weighted average grant date fair value - granted (in usd per share)			48.89
Weighted average grant date fair value - vested (in usd per share)			54.71
Weighted average grant date fair value - forfeited (in usd per share)			0.00
Weighted average grant date fair value - end of period (in usd per share)	$ 54.49		$ 54.49
Performance Vesting Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)			42
Granted (in shares)			0
Vested (in shares)			(12)
Forfeited (in shares)			0
Nonvested restricted stock units - end of period (in shares)	30		30
Service Based Restricted Stock Units | Share Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)			1,355
Granted (in shares)			732
Vested (in shares)			(486)
Forfeited (in shares)			(70)
Nonvested restricted stock units - end of period (in shares)	1,531		1,531
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)			$ 57.09
Weighted average grant date fair value - granted (in usd per share)			49.30
Weighted average grant date fair value - vested (in usd per share)			54.39
Weighted average grant date fair value - forfeited (in usd per share)			56.07
Weighted average grant date fair value - end of period (in usd per share)	$ 54.19		$ 54.19
Service Based Restricted Stock Units | Cash Settled
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock units - beginning of period (in shares)			988
Granted (in shares)			468
Vested (in shares)			(379)
Forfeited (in shares)			(70)
Nonvested restricted stock units - end of period (in shares)	1,007		1,007
2014 Long Term Equity Compensation Plan | Restricted Stock Units (RSUs)
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Fair value - vested during period			$ 44
Cliff Vesting | 2014 Long Term Equity Compensation Plan | Restricted Stock Units (RSUs)
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Award vesting period			3 years

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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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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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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