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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Equity RSUs and PSUs) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent Addition or Reduction In Restricted Stock Units If Performance Is Below Level Defined In Agreement | 25.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Granted in period (number of RSUs and PSUs) | 600,000 | 1,500,000 | 755,000
Vested in Period (number of RSUs and PSUs) |  |  | 0
Performance Shares [Member] | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Performance Share Unit Payout | 175.00% |  |
Performance Shares [Member] | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance Share Unit Payout | 0.00% |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Balance at beginning of period (in number of RSUs and PSUs) | 7,218,227 |  |
Granted in period (number of RSUs and PSUs) | 2,062,067 |  |
Vested in Period (number of RSUs and PSUs) | (3,175,437) |  |
Forfeited in Period (number of RSUs and PSUs) | (554,233) |  |
Balance at end of period (in number of RSUs and PSUs) | 5,550,624.000000 | 7,218,227 |
Beginning Balance - weighted average grant date fair value | $ 18.08 |  |
Granted - Weighted average grant date fair value | 15.37 |  |
Vested - weighted average grant date fair value | 15.45 |  |
Forfeited - weighted average grant date fair value | 11.23 |  |
Ending balance - weighted average grant date fair value | $ 19.27 | $ 18.08 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ 105 |  |
Fair value of RSUs and PSUs granted | 32 | $ 37 | $ 46
Intrinsic value of RSUs and PSUs vested | 45 | $ 22 | $ 22
Total unrecognized compensation cost related to unvested RSUs and PSUs expected to be recognized over a weighted-average period | $ 6 |  |
Weighted-average period used in calculating unrecognized compensation cost, RSUs and PSUs (in years) | 1 year 5 months |  |
Outside Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |
Outside Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
2017 [Member] | Share Based Compensation Award Tranches Two and Three [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Granted in period (number of RSUs and PSUs) | 374,000 |  |
2016 [Member] | Share-based Compensation Award, Tranche Three [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Granted in period (number of RSUs and PSUs) | 497,000 |  |

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