ACQUISITIONS - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Combinations [Abstract]
Business Acquisition, Pro Forma Revenue	$ 1,924	$ 1,962	$ 3,821	$ 3,841
Business Acquisition, Pro Forma Net Income (Loss)	$ 31	$ 22	$ 66	$ 11
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.18	$ 0.13	$ 0.39	$ 0.07

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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