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STOCK-BASED COMPENSATION - Stock Options (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Options |  |  |
Vesting period | 5 years |  |
Expiration period | 10 years |  |
Shares |  |  |
Outstanding at the beginning of the period (in shares) | 12,000,000 | 18,000,000 | 24,000,000
Granted (in shares) | 474,500 | 0 | 0
Exercised (in shares) | 5,000,000 | 5,000,000 | 2,000,000
Forfeited (in shares) | 0 | 3,000,000 | 4,000,000
Forfeitures upon spin off (in shares) | 0 | 0 | 0
Modification upon spin off (in shares) | 0 | 2,000,000 | 0
Outstanding at the end of the period (in shares) | 7,000,000 | 12,000,000 | 18,000,000
Option shares vested and expected to vest at the end of the period (in shares) | 7,000,000 | 12,000,000 | 18,000,000
Option shares exercisable at the end of the period (in shares) | 6,000,000 | 10,000,000 | 15,000,000
Weighted average exercise price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 17 | $ 21 | $ 22
Granted (in dollars per share) | 26 | 26 | 22
Exercised (in dollars per share) | 21 | 17 | 16
Forfeited (in dollars per share) | 0 | 29 | 28
Forfeitures upon spin off (in dollars per share) | 0 | 19 | 0
Outstanding at the end of the period (in dollars per share) | 15 | 17 | 21
Option shares vested and expected to vest at the end of the period (in dollars per share) | 15 | 17 | 21
Option shares exercisable at the end of the period (in dollars per share) | $ 13 | $ 18 | $ 22
Aggregate intrinsic value |  |  |
Exercised shares | $ 64 | $ 50 | $ 22
Option shares vested and expected to vest at the end of the period | 118 | 133 | 110
Option shares exercisable at the end of the period | $ 102 | $ 113 | $ 84
Weighted average remaining option term |  |  |
Outstanding at the end of the period | 4 years | 3 years | 4 years
Option shares vested and expected to vest at the end of the period | 4 years | 3 years | 4 years
Option shares exercisable at the end of the period | 3 years | 3 years | 3 years
Additional disclosures |  |  |
Total unrecognized compensation expense | $ 6 | $ 6 | $ 6
Weighted average remaining vesting period | 3 years | 2 years | 2 years

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- Definition Weighted average fair value as of the grant date of option plans that were not exercised or put into effect as a result of the occurrence of a terminating event being a spin off. + References No definition available. + Details
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- Definition Share-based Compensation, Arrangement by Share Based Payment Award Options, Outstanding, Weighted Average Remaining Option Term [Abstract] + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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