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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Principal Plans
Projected benefit obligation (PBO)	$ 2,123	$ 2,089
Accumulated benefit obligation (ABO)	2,123	2,089
Fair value of plan assets	2,019	2,018
All Other Pension Plans
Projected benefit obligation (PBO)	346	352
Accumulated benefit obligation (ABO)	298	305
Fair value of plan assets	310	303
Defined Benefit Pension Plans
Projected benefit obligation (PBO)	2,469	2,441	$ 3,811
Accumulated benefit obligation (ABO)	2,421	2,394
Fair value of plan assets	$ 2,329	$ 2,321	$ 3,744

X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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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