Note 13 - Employee Retirement Plans - Net Periodic Benefit Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member] | UNITED STATES
Service cost	$ 102	$ 92	$ 76
Interest cost	78	110	133
Expected return on plan assets	(209)	(186)	(161)
Amortization of prior service cost (credit)	4	6	7
Recognition of actuarial loss	10	12	66
Total net periodic benefit (income) expense	(15)	34	121
Special termination benefit charge		8	6
Total (income) expense	(15)	42	127
Current year actuarial (gain) loss	(105)	94	47
Recognition of actuarial loss	(10)	(12)	(66)
Current year prior service cost		1
Amortization of prior service (cost) credit	(4)	(6)	(7)
Total recognized in other comprehensive (loss) income	(119)	77	(26)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	25	26	25
Interest cost	10	12	15
Expected return on plan assets	(7)	(9)	(10)
Amortization of prior service cost (credit)	(1)	(1)	(1)
Recognition of actuarial loss	1	10	24
Total net periodic benefit (income) expense	28	38	53
Total (income) expense	28	38	53
Curtailment effects		(4)
Current year actuarial (gain) loss	(7)	(11)	41
Recognition of actuarial loss	(1)	(10)	(24)
Amortization of prior service (cost) credit	1	1	1
Total recognized in other comprehensive (loss) income	(7)	(24)	18
Other Postretirement Benefits Plan [Member]
Service cost	10	9	9
Interest cost	15	20	27
Amortization of prior service cost (credit)	(6)	(5)	(7)
Amortization of actuarial loss (gain)	2	1	(1)
Total net periodic benefit (income) expense	21	25	28
Special termination benefit charge		1	1
Total (income) expense	21	26	29
Current year actuarial (gain) loss	(105)	58	6
Amortization of actuarial (loss) gain	(2)	(1)	1
Current year prior service cost			5
Amortization of prior service (cost) credit	6	5	7
Total recognized in other comprehensive (loss) income	$ (101)	$ 62	$ 19