Note 12 - Pension and Postretirement Benefit Plans - Reconciliations of Changes in Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan [Member]
Fair value at beginning of period	$ 802
Fair value at end of period	850	$ 802
UNITED STATES | Pension Plan [Member]
Obligation at beginning of period	772	1,501
Interest cost	21	40	$ 43
Actuarial loss	68	13
Benefit payments	(51)	(90)
Acquisitions		161
Settlements		(853)
Obligation at end of period	810	772	1,501
Fair value at beginning of period	724	1,301
Actual return on plan assets	107	171
Employer contributions	1	59
Benefit payments	(51)	(90)
Settlements		(853)
Acquisitions		136
Fair value at end of period	781	724	1,301
Funded status at end of period	(29)	(48)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Obligation at beginning of period	3
Actuarial loss	1	1
Benefit payments		(1)
Acquisitions		3
Obligation at end of period	4	3
Fair value at beginning of period	0	0
Employer contributions		1
Benefit payments		(1)
Fair value at end of period	0	0	0
Funded status at end of period	(4)	(3)
Foreign Plan [Member] | Pension Plan [Member]
Obligation at beginning of period	412	364
Interest cost	5	8	7
Service cost	9	8	7
Actuarial loss	10	41
Benefit payments	(13)	(14)
Acquisitions		25
Settlements	(4)	(13)
Curtailment		(1)
Deconsolidation of subsidiary	(8)
Translation adjustments	27	(6)
Obligation at end of period	438	412	364
Fair value at beginning of period	78	71
Actual return on plan assets	3	11
Employer contributions	14	17
Benefit payments	(13)	(14)
Settlements	(4)	(13)
Acquisitions		7
Deconsolidation of subsidiary	(8)
Translation adjustments	(1)	(1)
Fair value at end of period	69	78	71
Funded status at end of period	(369)	(334)
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Obligation at beginning of period	88	83
Interest cost	2	3	3
Service cost	1		1
Actuarial loss	4	2
Benefit payments	(4)	(4)
Translation adjustments	2	4
Obligation at end of period	93	88	83
Fair value at beginning of period	0	0
Employer contributions	4	4
Benefit payments	(4)	(4)
Fair value at end of period	0	0	$ 0
Funded status at end of period	$ (93)	$ (88)