Note 3 - Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 493	$ 493	$ 264
Acquisitions		21	234
Impairment	(51)	(51)	(6)
Currency impact		16	1
Balance		479	493
Light Vehicle Segment [Member]
Balance	3	3	3
Impairment		(3)
Balance			3
Commercial Vehicle Segment [Member]
Balance	228	228	150
Acquisitions		(5)	74
Impairment	(48)	(48)
Currency impact		2	4
Balance		177	228
Off-Highway Segment [Member]
Balance	$ 262	262	105
Acquisitions		26	160
Currency impact		14	(3)
Balance		$ 302	262
Power Technologies Segment [Member]
Balance			6
Impairment			$ (6)

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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