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Note 5 - Retirement Plans - Components of Net Periodic Pension and OPEB Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net periodic pension cost	$ 0	$ 9	$ 85
Pension Plan [Member]
Service cost	52	93	110
Interest cost	187	123	104
Expected return on plan assets	(248)	(293)	(270)
Actuarial loss	$ 9	$ 86	$ 141

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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