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SHARE-BASED COMPENSATION (DETAILS) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
May. 31, 2012 | May. 31, 2009 | May. 31, 2007 | Feb. 24, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Fair value of restricted stock and cash settled awards vested |  |  |  |  | $ 75 | $ 68 | $ 70
Unrecognized compensation costs |  |  |  |  | $ 95 | $ 112 |
Weighted average period for recognition of share based compensation |  |  |  |  | 1 year 294 days | 2 years 102 days |
Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  | 661,398 | 1,121,066 | 1,007,425
Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  | 487,758 | 1,018,083 |
Service Based Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  | 557,000 |  |
Service Based Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  | 469,099 |  |
Performance Based Restricted Stock and Restricted Stock Units [Member] | Share Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  | 104,000 |  |
Performance Based Restricted Stock and Restricted Stock Units [Member] | Cash Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  |  | 18,659 |  |
2007 Long-term Equity Compensation Plan [Member] | Share Settled [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Additional shares authorized for issuance under plan | 6,000,000 | 4,000,000 | 5,000,000 |  |  |  |
Maximum number of shares to be issued under the plan |  |  |  |  | 15,000,000 |  |
Number of awards available for grant under plan |  |  |  |  | 6,007,637 |  |
Period of time subsequent to a change in control during which plan allows for accelerated vesting of awards for certain terminations |  |  |  |  | 2 years |  |
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  | 495,195 |  |  |
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  | 1,046,299 |  |  |
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Cliff Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
General award vesting period |  |  |  |  | 3 years |  |
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Graded Vesting [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
General award vesting period |  |  |  |  | 4 years |  |
Annual award vesting percentage |  |  |  |  | 25.00% |  |
2007 Long-term Equity Compensation Plan [Member] | Performance Based Restricted Stock and Restricted Stock Units [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted stock and restricted stock units granted |  |  |  | 121,278 |  |  |
2003 Long-term Equity Compensation Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiry date from date of grant |  |  |  |  | 10 years |  |

X
- Definition The portion of an award (on the anniversary of each grant date) that is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 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 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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