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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Employee Benefits |
Schedule of Plans' assets measured at estimated fair value |
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​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions of dollars) | ​ | 2022 | ​ | Level 1 | ​ | Level 2 | ​ | Level 3
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Domestic equity securities | ​ | $ | 84 | ​ | $ | 84 | ​ | $ | — | ​ | $ | —
Foreign equity securities | ​ |  | 60 | ​ |  | 60 | ​ |  | — | ​ |  | —
Domestic fixed income mutual funds | ​ | ​ | 26 | ​ | ​ | 26 | ​ | ​ | — | ​ | ​ | —
Foreign fixed income mutual funds | ​ |  | 11 | ​ | ​ | 11 | ​ | ​ | — | ​ |  | —
Money market funds | ​ |  | 1 | ​ |  | 1 | ​ | ​ | — | ​ |  | —
Total assets | ​ | $ | 182 | ​ | $ | 182 | ​ | $ | — | ​ | $ | —
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​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions of dollars) | ​ | 2021 | ​ | Level 1 | ​ | Level 2 | ​ | Level 3
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Domestic equity securities | ​ | $ | 113 | ​ | $ | 113 | ​ | $ | — | ​ | $ | —
Foreign equity securities | ​ |  | 71 | ​ |  | 71 | ​ |  | — | ​ |  | —
Domestic fixed income mutual funds | ​ |  | 29 | ​ |  | 29 | ​ |  | — | ​ |  | —
Foreign fixed income mutual funds | ​ |  | 12 | ​ |  | 12 | ​ |  | — | ​ |  | —
Money market funds | ​ |  | 2 | ​ |  | 2 | ​ |  | — | ​ |  | —
Total assets | ​ | $ | 227 | ​ | $ | 227 | ​ | $ | — | ​ | $ | —
Schedule of assumptions used in determining pension information for qualified and nonqualified plans | ​
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​ | ​ | Years ended December 31, |
​ |  | 2022 | ​ | 2021 |  | 2020 |
Weighted average assumptions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discount rate used to determine obligations | ​ | 5.30 | - | 5.40 | % | 1.20 | - | 2.90 | % | 0.70 | - | 2.60 | %
Discount rate used to determine net periodic benefit cost | ​ | 1.20 | - | 2.90 | % | 0.70 | - | 2.60 | % | 2.15 | - | 3.50 | %
Expected return on plan assets | ​ | ​ | ​ | 6.25 | % | ​ | ​ | 6.25 | % | ​ | ​ | 6.25 | %
Long-term rate of increase in compensation levels | ​ | ​ | ​ | 4.00 | % | ​ | ​ | 4.00 | % | ​ | ​ | 4.00 | %
Schedule of aggregate changes in the benefit obligation and fair value of assets for the qualified and nonqualified plans and the funded status | ​
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​ | ​ | December 31, | ​
​ |  | ​ | 2022 | ​ | 2021 |
(Millions of dollars) | ​ | ​ | Accumulated benefits exceed assets | ​ | ​ | Accumulated benefits exceed assets | ​
Reconciliation of benefit obligation: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligation at beginning of year | ​ | $ | 362 | ​ | $ | 379 | ​
Service cost | ​ |  | 9 | ​ |  | 10 | ​
Interest cost | ​ |  | 10 | ​ |  | 9 | ​
Actuarial gains | ​ |  | (97) | ​ |  | (10) | ​
Plan settlements | ​ | ​ | — | ​ | ​ | (19) | ​
Benefits paid | ​ |  | (8) | ​ |  | (7) | ​
Benefit obligation at end of year | ​ | $ | 276 | ​ | $ | 362 | ​
Reconciliation of fair value of plan assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ | $ | 227 | ​ | $ | 206 | ​
Actual return on plan assets | ​ |  | (38) | ​ |  | 27 | ​
Employer contributions | ​ |  | 1 | ​ |  | 20 | ​
Plan settlements | ​ | ​ | — | ​ | ​ | (19) | ​
Benefits paid | ​ |  | (8) | ​ |  | (7) | ​
Fair value of plan assets at end of year | ​ | $ | 182 | ​ | $ | 227 | ​
Funded status | ​ | $ | (94) | ​ | $ | (135) | ​
Schedule of net periodic benefit cost for all plans |
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​ | ​ |  | Years ended December 31, | ​
(Millions of dollars) |  |  | 2022 |  | 2021 |  | 2020 | ​
Components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | ​ | $ | 9 | ​ | $ | 10 | ​ | $ | 9 | ​
Interest cost | ​ | ​ |  | 10 | ​ |  | 9 | ​ |  | 11 | ​
Expected return on plan assets | ​ | ​ |  | (14) | ​ |  | (12) | ​ |  | (11) | ​
Amortization | ​ | ​ |  | 6 | ​ |  | 9 | ​ |  | 7 | ​
Settlement loss recognized | ​ | ​ | ​ | — | ​ | ​ | 6 | ​ | ​ | 11 | ​
Net periodic benefit cost | ​ | ​ | $ | 11 | ​ | $ | 22 | ​ | $ | 27 | ​

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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