SHARE-BASED AND OTHER COMPENSATION PROGRAMS - Restricted Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Awards Plan [Line Items]
Share based compensation expense	$ 211	$ 192	$ 340
Share Based Compensation Equity Instruments Other Than Options Plan Activity [Abstract]
Fair value of awards vested	$ 0	58
Restricted Stock Units (RSUs) \| Parent
Restricted Awards Plan [Line Items]
Vesting period	3 years
Trading period for cash payment once vested	20 days
Share based compensation expense	$ 174	$ 171	286
Unvested restricted shares and holding units	19,800,000
Compensation cost not yet recognized	$ 36
Compensation cost, recognition period	3 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning Balance (in shares)	51,460
Granted (in shares)	10,578
Vested (in shares)	28,028
Unvested, Ending Balance (in shares)	34,010	51,460
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, Beginning Balance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 15.37
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	23.25
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	14.63
Unvested, Ending Balance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 18.43	$ 15.37
Share Based Compensation Equity Instruments Other Than Options Plan Activity [Abstract]
Fair value of awards vested	$ 1	$ 1	$ 1
Graded Vesting Period Over Three Years \| Restricted Stock Units (RSUs) \| Parent
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	44,333

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The number of non-vested equity-based payment instruments,holding units, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

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Share-Based Compensation Arrangement By Share-Based Payment Award, Vesting Payment Trading Period

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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-Publisher FASB
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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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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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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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