Note 1 - Basis of Presentation - Disposal of Assets and Purchase of Property and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Proceeds from sale of assets	$ 0	$ (1)
Proceeds from Repack	(4)	(6)
Net book value of assets disposed	1	1
Other	(1)	0
Gain on disposal of assets, net	(4)	(6)
Recurring purchases - operations	12	21
Repack	1	6
Total	$ 13	$ 27