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 number of common shares reserved for future issuance.

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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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Net number of share options (or share units) granted during the period.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	May 31, 2014
Stock option activity
Share-based compensation expense	$ 23	$ 33		$ 51	$ 97
Restructuring and integration costs	18	20		36	58
Remaining unrecognized compensation expense related to non-vested awards	150			$ 150
Weighted average service period over which compensation cost is expected to be recognized (in years)				2 years 3 months 11 days
Chief Executive Officer
Stock option activity
Share-based compensation expense					$ 28
Chief Executive Officer \| Employee Severance
Stock option activity
Restructuring and integration costs			$ 9
Chief Executive Officer \| Special Termination Benefits
Stock option activity
Restructuring and integration costs			$ 2
Stock options
Stock option activity
Granted (in shares)				1,525,000	1,350,000
Weighted average exercise price (in usd per share)				$ 14.27	$ 23.96
Weighted average grant date fair value of stock options (in usd per share)				$ 5.99	$ 13.87
Share-based compensation expense	$ 5	$ 4		$ 10	$ 7
Time-based RSUs
Stock option activity
Granted (in shares)				3,425,000	1,408,000
Weighted average grant date fair value of stock options (in usd per share)				$ 11.68	$ 31.51
Performance-based RSUs
Stock option activity
Granted (in shares)				416,000	1,375,000
Weighted average grant date fair value of stock options (in usd per share)					$ 37.22
TSR Performance-based RSUs
Stock option activity
Granted (in shares)				208,000
Weighted average grant date fair value of stock options (in usd per share)				$ 16.34
ROTC Performance-based RSUs
Stock option activity
Granted (in shares)				208,000
Weighted average grant date fair value of stock options (in usd per share)				$ 15.76
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grant under the share based compensation plan (in shares)						18,000,000
Common shares available for issuance (in shares)						20,000,000
Number of shares available for future grant (in shares)	6,711,000			6,711,000