OTHER COMPREHENSIVE INCOME - COMPONENTS AND CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS - HUNTSMAN INTERNATIONAL (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 |
HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | $ 2,488 | $ 2,834 | $ 2,834 | |
Revised beginning balance | | | | $ 2,834 |
Balance at the end of the period | 2,640 | 3,279 | 2,488 | 2,834 |
Total | | | | |
Components of other comprehensive income | | | | |
Other comprehensive (loss) income before reclassifications, gross | 40 | 81 | | |
Tax benefit | 2 | 1 | | |
Amounts reclassified from accumulated other comprehensive loss, gross | 15 | 22 | | |
Tax benefit (expense) | (3) | (1) | | |
Net current-period other comprehensive income (loss) | 54 | 103 | | |
Total | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | (1,344) | (1,406) | (1,406) | |
Revised beginning balance | | (1,416) | | |
Other comprehensive (loss) income before reclassifications, gross | 40 | 80 | | |
Tax benefit | 1 | 3 | | |
Amounts reclassified from accumulated other comprehensive loss, gross | 16 | 22 | | |
Tax benefit (expense) | (3) | | | |
Net current-period other comprehensive income (loss) | 54 | 105 | | |
Balance at the end of the period | (1,290) | (1,311) | (1,344) | (1,406) |
Foreign currency translation adjustment | | | | |
Components of other comprehensive income | | | | |
Other comprehensive (loss) income before reclassifications, gross | 40 | 83 | | |
Tax benefit | 2 | 4 | | |
Net current-period other comprehensive income (loss) | 42 | 87 | | |
Foreign currency translation adjustment, tax | 69 | 61 | 71 | (65) |
Foreign currency translation adjustment | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | (376) | (252) | (252) | |
Revised beginning balance | | (252) | | |
Other comprehensive (loss) income before reclassifications, gross | 40 | 81 | | |
Tax benefit | 1 | 4 | | |
Net current-period other comprehensive income (loss) | 41 | 85 | | |
Balance at the end of the period | (335) | (167) | (376) | (252) |
Foreign currency translation adjustment, tax | 56 | 48 | 57 | 51 |
Pension and other postretirement benefits adjustments | | | | |
Components of other comprehensive income | | | | |
Other comprehensive (loss) income before reclassifications, gross | | (2) | | |
Amounts reclassified from accumulated other comprehensive loss, gross | 15 | 22 | | |
Tax benefit (expense) | (3) | 5 | | |
Net current-period other comprehensive income (loss) | 12 | 25 | | |
Pension and other postretirement benefits adjustments, tax | 132 | 177 | 135 | 172 |
Pension and other postretirement benefits adjustments | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | (977) | (1,174) | (1,174) | |
Revised beginning balance | | (1,174) | | |
Other comprehensive (loss) income before reclassifications, gross | | (2) | | |
Amounts reclassified from accumulated other comprehensive loss, gross | 16 | 22 | | |
Tax benefit (expense) | (3) | 5 | | |
Net current-period other comprehensive income (loss) | 13 | 25 | | |
Balance at the end of the period | (964) | (1,149) | (977) | (1,174) |
Pension and other postretirement benefits adjustments, tax | 158 | 204 | 161 | 199 |
Other comprehensive income of unconsolidated affiliates | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | 8 | 3 | 3 | |
Revised beginning balance | | 3 | | |
Other comprehensive (loss) income before reclassifications, gross | | 1 | | |
Net current-period other comprehensive income (loss) | | 1 | | |
Balance at the end of the period | 8 | 4 | 8 | 3 |
Other, net | | | | |
Components of other comprehensive income | | | | |
Tax benefit | | (3) | | |
Tax benefit (expense) | | (6) | | |
Net current-period other comprehensive income (loss) | | (9) | | |
Other, net | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | 1 | 17 | 17 | |
Revised beginning balance | | 7 | | |
Tax benefit | | (1) | | |
Tax benefit (expense) | | (5) | | |
Net current-period other comprehensive income (loss) | | (6) | | |
Balance at the end of the period | 1 | 1 | 1 | 17 |
Amounts attributable to noncontrolling interests | | | | |
Components of other comprehensive income | | | | |
Other comprehensive (loss) income before reclassifications, gross | (2) | (7) | | |
Net current-period other comprehensive income (loss) | (2) | (7) | | |
Disposition of a portion of Venator | | (16) | | |
Amounts attributable to noncontrolling interests | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | 36 | 143 | 143 | |
Revised beginning balance | | 143 | | |
Other comprehensive (loss) income before reclassifications, gross | (2) | (7) | | |
Net current-period other comprehensive income (loss) | (2) | (7) | | |
Disposition of a portion of Venator | | (16) | | |
Balance at the end of the period | 34 | 120 | 36 | 143 |
Accumulated other comprehensive (loss) income | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | | | (10) |
Other comprehensive (loss) income before reclassifications, gross | 38 | 74 | | |
Tax benefit | 2 | 1 | | |
Amounts reclassified from accumulated other comprehensive loss, gross | 15 | 22 | | |
Tax benefit (expense) | (3) | (1) | | |
Net current-period other comprehensive income (loss) | 52 | 96 | | |
Disposition of a portion of Venator | | (16) | | |
Accumulated other comprehensive (loss) income | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Balance at the beginning of the period | (1,308) | (1,263) | (1,263) | |
Cumulative effect of changes in fair value of equity investments | | | | (10) |
Revised beginning balance | | (1,273) | | (1,273) |
Other comprehensive (loss) income before reclassifications, gross | 38 | 73 | | |
Tax benefit | 1 | 3 | | |
Amounts reclassified from accumulated other comprehensive loss, gross | 16 | 22 | | |
Tax benefit (expense) | (3) | | | |
Net current-period other comprehensive income (loss) | 52 | 98 | | |
Disposition of a portion of Venator | | (16) | | |
Balance at the end of the period | $ (1,256) | (1,191) | $ (1,308) | $ (1,263) |
ASU 2016-01 | Total | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | (10) | | |
ASU 2016-01 | Total | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | (10) | | |
ASU 2016-01 | Other, net | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | (10) | | |
ASU 2016-01 | Other, net | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | (10) | | |
ASU 2016-01 | Accumulated other comprehensive (loss) income | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | (10) | | |
ASU 2016-01 | Accumulated other comprehensive (loss) income | HUNTSMAN INTERNATIONAL LLC AND SUBSIDIARIES | | | | |
Components of other comprehensive income | | | | |
Cumulative effect of changes in fair value of equity investments | | $ (10) | | |