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Employee and Agent Benefits - Weighted Average Assumptions (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension benefits |  |  |
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section |  |  |
Discount rate: Benefit obligation (as a percent) | 4.90% | 5.10% |
Interest crediting rate - cash balance benefit | 5.00% | 5.00% |
Rate of compensation increase: Benefit obligation (as a percent) | 4.56% | 4.53% |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate: Net periodic benefit cost (as a percent) | 5.10% | 2.75% | 2.50%
Expected long-term return on plan assets: Net periodic benefit cost (as a percent) | 6.20% | 5.20% | 5.55%
Interest crediting rate - cash balance benefit | 5.00% | 5.00% | 5.00%
Pension benefits, Cash balance benefit |  |  |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Rate of compensation increase: Net periodic benefit cost (as a percent) | 4.53% | 4.59% | 4.92%
Pension benefits, Traditional benefit |  |  |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Rate of compensation increase: Net periodic benefit cost (as a percent) |  |  | 2.96%
Other postretirement benefits |  |  |
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section |  |  |
Discount rate: Benefit obligation (as a percent) | 4.80% | 5.00% |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate: Net periodic benefit cost (as a percent) | 5.00% | 2.50% | 2.10%
Expected long-term return on plan assets: Net periodic benefit cost (as a percent) | 5.05% | 4.25% | 4.25%
Assumed Health Care Cost Trend Rates |  |  |
Health care cost trend rate assumed for next year under age 65 (as a percent) | 7.50% | 7.00% |
Health care cost trend rate assumed for next year age 65 and over (as a percent) | 6.50% | 6.00% |
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate) (as a percent) | 4.50% | 4.50% |
Year that the health care cost trend rate reaches the ultimate trend rate under age 65 (calendar year) | 2032 | 2031 |
Year that the health care cost trend rate reaches the ultimate trend rate age 65 and over (calendar year) | 2031 | 2028 |
Home office and agent pre-65 medical/life plans |  |  |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Expected long-term return on plan assets: Net periodic benefit cost (as a percent) | 5.20% |  |
Post-65 medical plans |  |  |
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Expected long-term return on plan assets: Net periodic benefit cost (as a percent) | 4.60% |  |

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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan due to factors other than changes in the composition of the plan population by age and dependency status. This rate is for people age 65 and over. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan due to factors other than changes in the composition of the plan population by age and dependency status. This rate is for people under age 65. + References No definition available. + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. This year is for people age 65 and over. + References No definition available. + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. This year is for people under age 65. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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