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Employee and Agent Benefits - Target Plan Asset Allocation (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension benefits
Asset category target allocation
Defined Benefit Plan, Tax Status [Extensible Enumeration]	Qualified Plan [Member]	Qualified Plan [Member]
Pension benefits | Fixed income security portfolios
Asset category target allocation
Asset category target allocation	70.00%
Pension benefits | Equity portfolios
Asset category target allocation
Asset category target allocation	15.00%
Pension benefits | Private Investments
Asset category target allocation
Asset category target allocation	15.00%
Other postretirement benefits | U.S. equity portfolios
Asset category target allocation
Asset category target allocation	35.00%
Other postretirement benefits | International equity portfolios
Asset category target allocation
Asset category target allocation	15.00%
Other postretirement benefits | Fixed income security portfolios
Asset category target allocation
Asset category target allocation	50.00%

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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