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SHARE-BASED COMPENSATION - Share and cash settled awards (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Performance Based Restricted Stock and Restricted Stock Units | Share Settled |  |
Number of Restricted Stock |  |
Nonvested restricted stock - beginning of year (in shares) | 283,000 | 201,000
Granted (in shares) | 87,000 | 104,000
Performance Adjustment (in shares) |  | 26,000
Vested (in shares) | (119,000) | (48,000)
Forfeited (in shares) | (21,000) | 0
Nonvested restricted stock - end of year (in shares) | 230,000 | 283,000
Weighted Average Grant Date Fair Value |  |
Weighted average grant date fair value - beginning of year (in usd per share) | $ 51.27 | $ 49.24
Weighted average grant date fair value - granted (in usd per share) | 64.58 | 53.80
Weighted average grant date fair value - performance adjusted (in usd per share) |  | 45.95
Weighted average grant date fair value - vested (in usd per share) | 49.14 | 45.38
Weighted average grant date fair value - forfeited (in usd per share) | 55.00 | 0.00
Weighted average grant date fair value - end of year (in usd per share) | $ 57.08 | $ 51.27
Performance Based Restricted Stock and Restricted Stock Units | Cash Settled |  |
Number of Restricted Stock |  |
Nonvested restricted stock - beginning of year (in shares) | 68,000 | 70,000
Granted (in shares) | 15,000 | 18,000
Performance Adjustment (in shares) |  | 12,000
Vested (in shares) | (38,000) | (32,000)
Forfeited (in shares) | (3,000) | 0
Nonvested restricted stock - end of year (in shares) | 42,000 | 68,000
Service Based Restricted Stock And Restricted Stock Units | Share Settled |  |
Number of Restricted Stock |  |
Nonvested restricted stock - beginning of year (in shares) | 1,593,000 | 1,954,000
Granted (in shares) | 733,000 | 589,000
Vested (in shares) | (889,000) | (789,000)
Forfeited (in shares) | (82,000) | (161,000)
Nonvested restricted stock - end of year (in shares) | 1,355,000 | 1,593,000
Weighted Average Grant Date Fair Value |  |
Weighted average grant date fair value - beginning of year (in usd per share) | $ 48.88 | $ 43.34
Weighted average grant date fair value - granted (in usd per share) | 61.94 | 53.87
Weighted average grant date fair value - vested (in usd per share) | 47.48 | 39.29
Weighted average grant date fair value - forfeited (in usd per share) | 54.89 | 47.33
Weighted average grant date fair value - end of year (in usd per share) | $ 57.09 | $ 48.88
Service Based Restricted Stock And Restricted Stock Units | Cash Settled |  |
Number of Restricted Stock |  |
Nonvested restricted stock - beginning of year (in shares) | 1,392,000 | 1,433,000
Granted (in shares) | 432,000 | 497,000
Vested (in shares) | (763,000) | (377,000)
Forfeited (in shares) | (73,000) | (161,000)
Nonvested restricted stock - end of year (in shares) | 988,000 | 1,392,000
Restricted Stock Units (RSUs) |  |
Weighted Average Grant Date Fair Value |  |
Tax benefit related to share-based compensation costs incurred | $ 7 |
2014 Long Term Equity Compensation Plan | Cliff Vesting | Service Based Restricted Stock And Restricted Stock Units | Share Settled |  |
Number of Restricted Stock |  |
Vested (in shares) | (313,391) |
Weighted Average Grant Date Fair Value |  |
Vesting period | 3 years |
2014 Long Term Equity Compensation Plan | Cliff Vesting | Service Based Restricted Stock And Restricted Stock Units | Cash Settled |  |
Number of Restricted Stock |  |
Vested (in shares) | (307,556) |
Weighted Average Grant Date Fair Value |  |
Vesting period | 3 years |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Adjustment, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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