Note 1 - Description of Business and Summary of Significant Accounting Policies - Disposal of Assets and Purchase of Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Proceeds from sale of assets	$ 253	$ 9	$ 91
Proceeds from Repack (Note 1)	41	14	0
Net book value of assets disposed	(240)	(6)	(17)
Total	54	17	74
Recurring purchases - operations	89	41	32
Repack	20	27	3
Repack related	1	2	0
Total	$ 110	$ 70	$ 35