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EMPLOYEE BENEFIT PLANS (Notes) | 12 Months Ended
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Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Employee Benefit Plans (Notes) | EMPLOYEE BENEFIT PLANS Defined Benefit Pension and Other Postemployment Benefit Plans Defined Benefit Pension Plans - We have a defined benefit pension plan and a supplemental executive retirement plan, both of which are closed to new participants. Certain employees of the Texas Gas Service division are entitled to benefits under a frozen cash-balance pension plan. We fund our defined benefit pension costs at a level needed to maintain or exceed the minimum funding levels required by the Employee Retirement Income Security Act of 1974, as amended, and the Pension Protection Act of 2006. Other Postemployment Benefit Plans - We sponsor health and welfare plans that provide postemployment medical and life insurance benefits to certain employees who retire with at least five years of service. The postemployment medical plan is contributory based on hire date, age and years of service, with retiree contributions adjusted periodically, and contains other cost-sharing features such as deductibles and coinsurance. Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for pension and postemployment benefits for the periods indicated:
|  | December 31,
|  | 2023 |  | 2022
Discount rate - pension plans |  | 5.30% |  | 5.60%
Discount rate - other postemployment plans |  | 5.40% |  | 5.70%
Compensation increase rate |  | 3.50% - 4.30% |  | 3.60% - 5.00%
The following table sets forth the weighted-average assumptions used by us to determine the periodic benefit costs for pension and postemployment benefits for the periods indicated:
|  |  |  | Years Ended December 31,
|  |  |  | 2023 |  | 2022 |  | 2021
Discount rate - pension plans |  |  |  | 5.60% |  | 3.05%/4.55% (a) |  | 2.80%
Discount rate - other postemployment plans |  |  |  | 5.70% |  | 3.00% |  | 2.70%
Expected long-term return on plan assets - pension plans |  |  |  | 6.75% |  | 6.40% |  | 7.15%
Expected long-term return on plan assets - other postemployment plans |  |  |  | 5.55% |  | 5.85% |  | 7.50%
Compensation increase rate |  |  |  | 3.60% - 5.00% |  | 3.10% - 5.00% |  | 3.10% - 3.90%
(a) Pension plans were remeasured as of April 30, 2022. We determine our discount rates annually. We estimate our discount rate based upon a comparison of the expected cash flows associated with our future payments under our defined benefit pension and other postemployment obligations to a hypothetical bond portfolio created using high-quality bonds that closely match expected cash flows. Bond portfolios are developed by selecting a bond for each of the next 60 years based on the maturity dates of the bonds. Bonds selected to be included in the portfolios are only those rated by Moody’s as AA- or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds. We determine our overall expected long-term rate of return on plan assets based on our review of historical returns and economic growth models. We update our assumed mortality rates to incorporate new tables issued by the Society of Actuaries as needed. Regulatory Treatment - The OCC, KCC and regulatory authorities in Texas have approved the recovery of pension and other postemployment benefits costs through rates for Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively. The costs recovered through rates are based on current funding requirements and the net periodic benefit cost for defined benefit pension and other postemployment costs. Differences, if any, between the net periodic benefit cost, net of deferrals, and the amount recovered through rates are reflected in earnings. We historically have recovered defined benefit pension and other postemployment benefit costs through rates. We believe it is probable that regulators will continue to include the net periodic pension and other postemployment benefit costs in our cost of service. We capitalize all eligible service cost and non-service cost components pursuant to the accounting requirements of ASC Topic 980 (Regulated Operations) for rate-regulated entities, as these costs are authorized by our regulators to be included in capitalized costs. Noncurrent regulatory assets in our consolidated balance sheets reflect the capitalized non-service cost components of $2.2 million and $2.8 million as of December 31, 2023 and 2022, respectively. See Note 3 for additional information. Obligations and Funded Status - The following table sets forth our defined benefit pension and other postemployment benefit plans, benefit obligations and fair value of plan assets for the periods indicated:
| Pension Benefits |  | Other Postemployment Benefits
| December 31, |  | December 31,
| 2023 |  | 2022 |  | 2023 |  | 2022
Changes in Benefit Obligation | (Thousands of dollars) |  |
Benefit obligation, beginning of period | $ | 784,633 |  |  | $ | 1,049,990 |  |  | $ | 168,342 |  |  | $ | 222,806 |
Service cost | 7,242 |  |  | 10,369 |  |  | 730 |  |  | 1,274 |
Interest cost | 42,428 |  |  | 36,150 |  |  | 9,154 |  |  | 6,448 |
Plan participants’ contributions | — |  |  | — |  |  | 2,823 |  |  | 3,035 |
Actuarial loss (gain) | 23,015 |  |  | (259,261) |  |  | (5,551) |  |  | (48,609) |
Benefits paid | (53,713) |  |  | (55,326) |  |  | (16,963) |  |  | (16,612) |
Plan amendments | — |  |  | 2,711 |  |  | — |  |  | — |
Benefit obligation, end of period | $ | 803,605 |  |  | $ | 784,633 |  |  | 158,535 |  |  | $ | 168,342 |
Change in Plan Assets |  |  |  |  |  |  |
Fair value of plan assets, beginning of period | $ | 768,961 |  |  | $ | 1,013,244 |  |  | $ | 181,877 |  |  | $ | 231,994 |
Actual return (loss) on plan assets | 78,827 |  |  | (190,484) |  |  | 11,325 |  |  | (38,432) |
Employer contributions | 1,306 |  |  | 1,527 |  |  | 2,546 |  |  | 1,892 |
Plan participants’ contributions | — |  |  | — |  |  | 2,823 |  |  | 3,035 |
Benefits paid | (53,713) |  |  | (55,326) |  |  | (16,963) |  |  | (16,612) |
Fair value of assets, end of period | 795,381 |  |  | 768,961 |  |  | 181,608 |  |  | 181,877 |
Benefit Asset (Obligation), net at December 31 | $ | (8,224) |  |  | $ | (15,672) |  |  | $ | 23,073 |  |  | $ | 13,535 |
Other noncurrent assets | $ | 13,409 |  |  | $ | 5,267 |  |  | $ | 23,073 |  |  | $ | 13,535 |
Current liabilities | (1,368) |  |  | (1,352) |  |  | — |  |  | — |
Noncurrent liabilities | (20,265) |  |  | (19,587) |  |  | — |  |  | — |
Benefit Asset (Obligation), net at December 31 | $ | (8,224) |  |  | $ | (15,672) |  |  | $ | 23,073 |  |  | $ | 13,535 |
The accumulated benefit obligation for our defined benefit pension plans was $772.1 million and $746.8 million at December 31, 2023 and 2022, respectively. For the years ended December 31, 2023 and 2022, the pension benefit obligations experienced actuarial losses and gains of $23.0 million and $259.3 million, respectively, primarily due to the impact of increases in the discount rates used to calculate the benefit obligations. In 2024, our contributions are expected to be $1.4 million to our defined benefit pension plans, and no contributions are expected to be made to our other postemployment benefit plans. The following tables set forth the components of net periodic benefit cost for our pension and other postemployment benefit plans for the periods indicated:
|  |  |  |  | Pension Benefits
|  |  |  | Year Ended December 31,
|  |  |  |  | 2023 | 2022 | 2021
| (Thousands of dollars)
Components of net periodic benefit cost (credit) |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 7,242 |  | $ | 10,369 |  | $ | 13,811 |
Interest cost (a) |  |  |  |  | 42,428 |  | 36,150 |  | 29,458 |
Expected return on assets (a) |  |  |  |  | (59,518) |  | (58,528) |  | (62,382) |
Amortization of unrecognized prior service cost (a) |  |  |  |  | 372 |  | 248 |  | — |
Amortization of net loss (a) |  |  |  |  | 2,008 |  | 16,793 |  | 45,523 |
Net periodic benefit cost (credit) |  |  |  |  | $ | (7,468) |  | $ | 5,032 |  | $ | 26,410 |
(a) These amounts, net of any amounts capitalized as a regulatory asset, have been recognized as other income (expense), net in the consolidated statement of income. See Note 13 for additional detail for our other income (expense), net.
|  |  |  |  | Other Postemployment Benefits
|  |  |  | Year Ended December 31,
|  |  |  |  | 2023 | 2022 | 2021
|  |  |  |  | (Thousands of dollars) |
Components of net periodic benefit cost (credit) |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 730 |  | $ | 1,274 |  | $ | 1,587 |
Interest cost (a) |  |  |  |  | 9,154 |  | 6,448 |  | 6,251 |
Expected return on assets (a) |  |  |  |  | (9,728) |  | (13,181) |  | (16,807) |
Amortization of unrecognized prior service cost (credit) (a) |  |  |  |  | 153 |  | 41 |  | (279) |
Amortization of net (gain) loss (a) |  |  |  |  | (48) |  | 217 |  | 373 |
Net periodic benefit cost (credit) |  |  |  |  | $ | 261 |  | $ | (5,201) |  | $ | (8,875) |
(a) These amounts, net of any amounts capitalized as a regulatory asset, have been recognized as other income (expense), net in the consolidated statement of income. See Note 13 for additional detail for our other income (expense), net.
We use a December 31 measurement date for our plans. On April 30, 2022, we amended our defined benefit pension plans to change the variable cost of living adjustment for eligible participants to a fixed rate. Accordingly, we remeasured our net benefit obligations as of April 30, 2022, resulting in an adjustment of approximately $7.2 million to our pension expense, net of capitalization and regulatory deferrals, for the year ended December 31, 2022. Other Comprehensive Income (Loss) - The following table sets forth the amounts recognized in other comprehensive income (loss), net of regulatory deferrals, related to our defined benefit pension benefits for the period indicated:
| Pension Benefits
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| (Thousands of dollars)
Net gain (loss) arising during the period | $ | (619) |  |  | $ | 7,369 |  |  | $ | 67 |
Amortization of loss | 1 |  |  | 159 |  |  | 1,562 |
Deferred income taxes | 140 |  |  | (1,705) |  |  | (379) |
Total recognized in other comprehensive income (loss) | $ | (478) |  |  | $ | 5,823 |  |  | $ | 1,250 |
Due to our regulatory deferrals, there were no amounts recognized in other comprehensive income (loss) related to our other postemployment benefits for the periods presented. The tables below set forth the amounts in accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit expense for the periods indicated:
| Pension Benefits
| December 31,
| 2023 |  | 2022
| (Thousands of dollars)
Prior service cost | $ | (2,091) |  |  | $ | (2,463) |
Accumulated loss | (246,988) |  |  | (245,290) |
Accumulated other comprehensive loss before regulatory assets | (249,079) |  |  | (247,753) |
Regulatory asset for regulated entities | 247,684 |  |  | 246,975 |
Accumulated other comprehensive loss after regulatory assets | (1,395) |  |  | (778) |
Deferred income taxes | 213 |  |  | 74 |
Accumulated other comprehensive loss, net of tax | $ | (1,182) |  |  | $ | (704) |
| Other Postemployment Benefits
| December 31,
| 2023 |  | 2022
| (Thousands of dollars)
Prior service cost | $ | — |  |  | $ | (153) |
Accumulated loss | (1.457) |  |  | (8,557) |
Accumulated other comprehensive loss before regulatory assets | (1.457) |  |  | (8,710) |
Regulatory asset for regulated entities | 1.457 |  |  | 8,710 |
Accumulated other comprehensive loss after regulatory assets | $ | — |  |  | $ | — |
Health Care Cost Trend Rates - The following table sets forth the assumed health care cost-trend rates for the periods indicated:
| 2023 |  | 2022
Health care cost-trend rate assumed for next year | 6.00% |  | 6.50%
Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate) | 4.50% |  | 4.50%
Year that the rate reaches the ultimate trend rate | 2030 |  | 2030
Plan Assets - Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals. The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations. To achieve this strategy, we have established a liability-driven investment strategy to change the allocations as the funded status of the defined benefit pension plan increases. The plan’s investments include a diverse blend of various domestic and international equities, investment-grade debt securities which mirror the cash flows of our liability, insurance contracts and alternative investments. The current target allocation for the assets of our defined benefit pension plan is as follows:
Investment-grade bonds | 70.0 | %
U.S. large-cap equities | 13.0 | %
Alternative investments | 7.0 | %
Developed foreign large-cap equities | 5.0 | %
Mid-cap equities | 3.0 | %
Emerging markets equities | 1.0 | %
Small-cap equities | 1.0 | %
Total | 100.0 | %
As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above. All investment managers for the plan are subject to certain restrictions on the securities they purchase and, with the exception of indexing purposes, are prohibited from owning our stock. The current target allocation for the assets of our other postemployment benefits plan is 90 percent fixed income securities and 10 percent equity securities. The following tables set forth our pension and other postemployment benefits plan assets by fair value category as of the measurement date:
| Pension Benefits
| December 31, 2023
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 88,477 |  | $ | — |  | $ | — |  | $ | 88,477 |
Government obligations | — |  | 204,669 |  | — |  | 204,669 |
Corporate obligations (b) | — |  | 366,482 |  | — |  | 366,482 |
Cash and money market funds (c) | 5,300 |  | 28,977 |  | — |  | 34,277 |
Insurance contracts and group annuity contracts | — |  | — |  | 12,350 |  | 12,350 |
Other investments (d) | — |  | — |  | 89,126 |  | 89,126 |
Total assets | $ | 93,777 |  | $ | 600,128 |  | $ | 101,476 |  | $ | 795,381 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category primarily represents money market funds. (d) - This category represents alternative investments such as hedge funds and other financial instruments.
| Pension Benefits
| December 31, 2022
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 150,027 |  | $ | — |  | $ | — |  | $ | 150,027 |
Government obligations | — |  | 160,799 |  | — |  | 160,799 |
Corporate obligations (b) | — |  | 329,973 |  | — |  | 329,973 |
Cash and money market funds (c) | 4,466 |  | 22,185 |  | — |  | 26,651 |
Insurance contracts and group annuity contracts | — |  | — |  | 14,480 |  | 14,480 |
Other investments (d) | — |  | — |  | 87,031 |  | 87,031 |
Total assets | $ | 154,493 |  | $ | 512,957 |  | $ | 101,511 |  | $ | 768,961 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category primarily represents money market funds. (d) - This category represents alternative investments such as hedge funds and other financial instruments.
| Other Postemployment Benefits
| December 31, 2023
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 7,031 |  | $ | — |  | $ | — |  | $ | 7,031 |
Government obligations | — |  | 41,863 |  | — |  | 41,863 |
Corporate obligations (b) | — |  | 38,615 |  | — |  | 38,615 |
Cash and money market funds (c) | 751 |  | 13,245 |  | — |  | 13,996 |
Insurance contracts and group annuity contracts (d) | — |  | 80,102 |  | — |  | 80,102 |
Total assets | $ | 7,782 |  | $ | 173,825 |  | $ | — |  | $ | 181,607 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category primarily represents money market funds. (d) - This category includes equity securities and bonds held in a captive insurance product.
| Other Postemployment Benefits
| December 31, 2022
Asset Category | Level 1 | Level 2 | Level 3 | Total
| (Thousands of dollars)
Investments: |  |  |  |
Equity securities (a) | $ | 5,983 |  | $ | — |  | $ | — |  | $ | 5,983 |
Government obligations | — |  | 43,291 |  | — |  | 43,291 |
Corporate obligations (b) | — |  | 38,095 |  | — |  | 38,095 |
Cash and money market funds (c) | 750 |  | 7,621 |  | — |  | 8,371 |
Insurance contracts and group annuity contracts (d) | — |  | 86,137 |  | — |  | 86,137 |
Total assets | $ | 6,733 |  | $ | 175,144 |  | $ | — |  | $ | 181,877 |
(a) - This category represents securities of the various market sectors from diverse industries. (b) - This category represents bonds from diverse industries. (c) - This category primarily represents money market funds. (d) - This category includes equity securities and bonds held in a captive insurance product. Insurance contracts and group annuity contracts include investments in the Immediate Participation Guarantee Fund (“IPG Fund”) with John Hancock and are valued at fair value. John Hancock invests the IPG Fund in its general fund portfolio. The contract value of the IPG Fund at the end of the year, which approximates fair value, is estimated. The difference between this estimated balance and the actual balance, as subsequently determined by John Hancock, is charged or credited to the net assets of the plans. Certain investments that are categorized as money market funds in Level 2 and “Other investments” in Level 3 represent alternative investments such as hedge funds and other financial instruments measured using the net asset value per share (or its equivalent) practical expedient. The following tables set forth additional information regarding commitments and redemption limitations of these other investments at the periods indicated:
| December 31, 2023
| Fair Value | Unfunded Commitments | Redemption Frequency | Redemption Notice Period
| (in thousands) |  | (in days)
Grosvenor Registered Multi Limited Partnership | $ | 40,872 |  | $ | — |  | quarterly | 65
K2 Institutional Investors II Limited Partnership | $ | 48,254 |  | $ | — |  | quarterly | 91
| December 31, 2022
| Fair Value | Unfunded Commitments | Redemption Frequency | Redemption Notice Period
| (in thousands) |  | (in days)
Grosvenor Registered Multi Limited Partnership | $ | 40,160 |  | $ | — |  | quarterly | 65
K2 Institutional Investors II Limited Partnership | $ | 46,871 |  | $ | — |  | quarterly | 91
The following table sets forth the reconciliation of Level 3 fair value measurements of our pension plans for the periods indicated:
| Pension Benefits
| Insurance Contracts |  | Other Investments |  | Total
| (Thousands of dollars)
January 1, 2022 | $ | 17,301 |  |  | $ | 91,456 |  |  | $ | 108,757 |
Unrealized gains | 1,467 |  |  | — |  |  | 1,467 |
Unrealized losses | — |  |  | (7,458) |  |  | (7,458) |
Purchases | 182 |  |  | 3,033 |  |  | 3,215 |
Settlements | (4,470) |  |  | — |  |  | (4,470) |
December 31, 2022 | $ | 14,480 |  |  | $ | 87,031 |  |  | $ | 101,511 |
Unrealized gains | — |  |  | 2,095 |  |  | 2,095 |
Unrealized losses | (618) |  |  | — |  |  | (618) |
Purchases | 1,562 |  |  | — |  |  | 1,562 |
Settlements | (3,074) |  |  | — |  |  | (3,074) |
December 31, 2023 | $ | 12,350 |  |  | $ | 89,126 |  |  | $ | 101,476 |
Pension and Other Postemployment Benefit Payments - Benefit payments for our defined benefit pension and other postemployment benefit plans for the year ended December 31, 2023 were $55.3 million and $16.6 million, respectively. The following table sets forth the pension benefits and other postemployment benefits payments expected to be paid in 2023-2032:
| Pension Benefits |  | Other Postemployment Benefits
Benefits to be paid in: | (Thousands of dollars)
2024 | $ | 55,391 |  |  | $ | 14,127 |
2025 | $ | 55,988 |  |  | $ | 13,890 |
2026 | $ | 56,422 |  |  | $ | 13,505 |
2027 | $ | 56,591 |  |  | $ | 13,194 |
2028 | $ | 57,296 |  |  | $ | 12,848 |
2029 through 2033 | $ | 286,471 |  |  | $ | 59,299 |
The expected benefits to be paid are based on the same assumptions used to measure our benefit obligations at December 31, 2023, and include estimated future employee service. Other Employee Benefit Plans 401(k) Plan - We have a 401(k) plan which covers all eligible employees. Employee contributions are discretionary and we match 100 percent of each participant’s eligible contribution up to 6 percent of eligible compensation, subject to certain limits. Our contributions to the plan were $16.7 million, $15.3 million and $14.3 million in 2023, 2022 and 2021, respectively. Effective December 30, 2021, our profit sharing-plan was merged with and into our 401(k) Plan. We plan to make a profit-sharing contribution to the 401(k) Plan each quarter equal to 1 percent of each participant’s eligible compensation during the quarter. Additional discretionary profit-sharing contributions may be made at the end of each year. Our profit-sharing contributions made to the plan were $12.6 million, $10.9 million and $9.9 million in 2023, 2022 and 2021, respectively.

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