Note 2 - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 401	$ 196
Restricted cash reported in Other current assets	7	7
Restricted cash	69	53
Total cash, cash equivalents and restricted cash shown in the Statement of Cash Flows	$ 477	$ 256	$ 241	$ 290