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Pension and Other Postretirement Employee Benefit Plans - Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Fair value of plan assets	$ 22.1	$ 22.0

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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