Retirement Benefits - Funded Status (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Retirement Benefits [Abstract]
Benefit obligation	$ (1,195)	$ (1,225)
Fair value of plan assets	1,816	1,764
Over (under) funded status	$ 621	$ 539

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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+ Details