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Note 5 - Retirement Plans - Pre-tax Changes Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net actuarial (loss)/gain	$ 813	$ (408)	$ (88)
Actuarial loss	141	104	67
Total	$ 954	$ (304)	$ (21)

X

- Definition

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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