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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) | The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated:
|  | Unrealized Gains (Losses) on Risk- Management Assets/Liabilities (a) |  | Pension and Postretirement Benefit Plan Obligations (a) (b) |  | Unrealized Gains (Losses) on Risk- Management Assets/Liabilities of Unconsolidated Affiliates (a) |  | Accumulated Other Comprehensive Loss (a)
|  | (Thousands of dollars)
January 1, 2017 |  | $ | (52,155 | ) |  | $ | (101,236 | ) |  | $ | (959 | ) |  | $ | (154,350 | )
Other comprehensive income (loss) before reclassifications |  | (35,013 | ) |  | (12,337 | ) |  | (409 | ) |  | (47,759 | )
Amounts reclassified from accumulated other comprehensive loss |  | 45,541 |  |  | 8,162 |  |  | 164 |  |  | 53,867 |
Impact of Merger Transaction (c) |  | (40,288 | ) |  | — |  |  | — |  |  | (40,288 | )
Other comprehensive income (loss) attributable to ONEOK |  | (29,760 | ) |  | (4,175 | ) |  | (245 | ) |  | (34,180 | )
December 31, 2017 |  | (81,915 | ) |  | (105,411 | ) |  | (1,204 | ) |  | (188,530 | )
Beginning balance adjustments (d) |  | 3,078 |  |  | (805 | ) |  | (2,273 | ) |  | — |
Other comprehensive income (loss) before reclassifications |  | (5,673 | ) |  | (8,116 | ) |  | 2,396 |  |  | (11,393 | )
Amounts reclassified from accumulated other comprehensive loss |  | 36,870 |  |  | 12,887 |  |  | 28 |  |  | 49,785 |
Other comprehensive income (loss) attributable to ONEOK |  | 31,197 |  |  | 4,771 |  |  | 2,424 |  |  | 38,392 |
Impact of adoption of ASU 2018-02 (e) |  | (17,020 | ) |  | (20,340 | ) |  | (741 | ) |  | (38,101 | )
December 31, 2018 |  | $ | (64,660 | ) |  | $ | (121,785 | ) |  | $ | (1,794 | ) |  | $ | (188,239 | )
(a) All amounts are presented net of tax. (b) Includes amounts related to supplemental executive retirement plan. (c) Includes the remaining portion of ONEOK Partners’ accumulated other comprehensive loss at June 30, 2017, that we acquired in the Merger Transaction, related to commodity and interest-rate contracts. (d) Reclassifications were made between categories to conform to current presentation. (e) We elected to adopt this guidance in the first quarter 2018, which allows a reclassification from accumulated other comprehensive income/loss to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act. After adopting and applying this guidance, our accumulated other comprehensive loss balance does not include stranded taxes resulting from the Tax Cuts and Jobs Act.
Reclassification out of Accumulated Other Comprehensive Income (Loss) | The following table sets forth the effect of reclassifications from accumulated other comprehensive loss in our Consolidated Statements of Income for the periods indicated:
Details about Accumulated Other Comprehensive Loss Components |  | Years Ended December 31, |  | Affected Line Item in the Consolidated Statements of Income
2018 |  | 2017 |  | 2016
|  | (Thousands of dollars) |  |
Risk-management assets/liabilities |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (29,596 | ) |  | $ | (69,561 | ) |  | $ | 26,422 |  |  | Commodity sales revenues
Interest-rate contracts |  | (18,287 | ) |  | (21,025 | ) |  | (19,215 | ) |  | Interest expense
|  | (47,883 | ) |  | (90,586 | ) |  | 7,207 |  |  | Income before income taxes
|  | 11,013 |  |  | 26,899 |  |  | (230 | ) |  | Income taxes
|  | (36,870 | ) |  | (63,687 | ) |  | 6,977 |  |  | Net income
Noncontrolling interests |  | — |  |  | (18,146 | ) |  | 6,301 |  |  | Less: Net income attributable noncontrolling interests
|  | $ | (36,870 | ) |  | $ | (45,541 | ) |  | $ | 676 |  |  | Net income attributable to ONEOK
Pension and postretirement benefit plan obligations (a) |  |  |  |  |  |  |  |
Amortization of net loss |  | $ | (18,398 | ) |  | $ | (15,265 | ) |  | $ | (12,012 | ) |  | Other income (expense)
Amortization of unrecognized prior service cost |  | 1,662 |  |  | 1,662 |  |  | 1,662 |  |  | Other income (expense)
|  | (16,736 | ) |  | (13,603 | ) |  | (10,350 | ) |  | Income before income taxes
|  | 3,849 |  |  | 5,441 |  |  | 4,140 |  |  | Income taxes
|  | $ | (12,887 | ) |  | $ | (8,162 | ) |  | $ | (6,210 | ) |  | Net income attributable to ONEOK
Risk-management assets/liabilities of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |
Interest-rate contracts |  | $ | (36 | ) |  | $ | (367 | ) |  | $ | (63 | ) |  | Equity in net earnings from investments
|  | 8 |  |  | 97 |  |  | 10 |  |  | Income taxes
|  | (28 | ) |  | (270 | ) |  | (53 | ) |  | Net income
Noncontrolling interests |  | — |  |  | (106 | ) |  | (37 | ) |  | Less: Net income attributable to noncontrolling interests
|  | $ | (28 | ) |  | $ | (164 | ) |  | $ | (16 | ) |  | Net income attributable to ONEOK
Total reclassifications for the period attributable to ONEOK |  | $ | (49,785 | ) |  | $ | (53,867 | ) |  | $ | (5,550 | ) |  | Net income attributable to ONEOK
(a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note K for additional detail of our net periodic benefit cost.
Schedule of Accumulated Other Comprehensive Income (Loss) for Risk-Management Assets/Liabilities [Table Text Block] | The following table sets forth information about the balance of accumulated other comprehensive loss at December 31, 2018, representing unrealized gains/(losses) related to risk management assets and liabilities:
|  | Risk- Management Assets/Liabilities (a)
|  | (Thousands of dollars)
Commodity derivative instruments expected to be realized within the next 24 months (b) |  | $ | 37,589 |
Settled interest-rate swaps to be recognized over the life of the long-term, fixed-rate debt (c) |  | (40,037 | )
Forward-starting interest-rate swaps with future settlement dates expected to be amortized over the life of long-term fixed-rate debt upon issuance of the debt |  | (62,212 | )
Accumulated other comprehensive loss at December 31, 2018 |  | $ | (64,660 | )
(a) - All amounts are presented net of tax. (b) - Based on December 31, 2018, commodity prices, we will realize $37.5 million in net gains, net of tax, over the next 12 months and $0.1 million in net gains, net of tax, thereafter. (c) - Losses of $13.5 million, net of tax, will be reclassified into earnings during the next 12 months as the hedged items affect earnings.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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