Note 2 - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 395	$ 196
Restricted cash reported in Other current assets	8	7
Restricted cash	66	53
Total cash, cash equivalents and restricted cash shown in the Statement of Cash Flows	$ 469	$ 256	$ 212	$ 290