Note 11 - Employee Retirement Plans - Net Periodic Benefit Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan [Member] | UNITED STATES
Service cost	$ 80	$ 105	$ 102
Interest cost	168	98	78
Expected return on plan assets	(176)	(210)	(209)
Amortization of prior service cost (credit)	6	6	4
Recognition of actuarial (gain) loss	(16)	29	10
Total net periodic benefit expense (income)	62	28	(15)
Curtailment charge	3
Special termination benefit charge	15	2
Total expense (income)	80	30	(15)
Curtailment effects	(4)
Current year actuarial (loss) gain	(16)	16	(105)
Recognition of actuarial gain (loss)	16	(29)	(10)
Current year prior service cost		28
Amortization of prior service (cost) credit	(6)	(6)	(4)
Total recognized in other comprehensive (loss) income	(10)	9	(119)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	18	22	25
Interest cost	20	11	10
Expected return on plan assets	(13)	(9)	(7)
Amortization of prior service cost (credit)		(1)	(1)
Recognition of actuarial (gain) loss	1	8	1
Total net periodic benefit expense (income)	26	31	28
Total expense (income)	26	33	28
Settlements		11
Current year actuarial (loss) gain	14	(27)	(7)
Recognition of actuarial gain (loss)	1	20	(1)
Amortization of prior service (cost) credit		1	1
Total recognized in other comprehensive (loss) income	15	5	(7)
Other Postretirement Benefits Plan [Member]
Service cost	5	9	10
Interest cost	23	15	15
Amortization of prior service cost (credit)	(5)	(5)	(6)
Amortization of actuarial (gain) loss	(22)	(5)	2
Total net periodic benefit expense (income)	1	14	21
Special termination benefit charge	1
Total expense (income)	2	14	21
Current year actuarial (loss) gain	5	(209)	(105)
Amortization of actuarial gain (loss)	22	5	(2)
Amortization of prior service (cost) credit	(8)	5	6
Total recognized in other comprehensive (loss) income	$ 19	$ (199)	$ (101)