Benefit Plans - Pension Plan Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension plans' assets
Expected weighted average long-term rate of return on primary employee plan assets for the next fiscal year	10 years
Expected weighted average long-term rate of return on employee-agent plan assets for the next fiscal year	5 years
Pension benefits
Pension plans' assets
Notional amount of derivatives, maximum percentage of plan assets (as a percent)	130.00%
Expected weighted average long-term rate of return on plan assets	7.34%	7.35%	7.06%
Expected weighted average long-term rate of return on plan assets for the next fiscal year	7.58%
Arithmetic average of the annual actual return on plan assets for the last 10 years	7.80%
Arithmetic average of the annual actual return on plan assets for the last 5 years	6.00%