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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Net periodic pension cost	$ 85	$ 50	$ 34
Pension Plan [Member]
Service cost	110	91	80
Interest cost	104	137	160
Expected return on plan assets	(270)	(282)	(273)
Actuarial loss	$ 141	$ 104	$ 67

X

- Definition

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

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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