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Note 2 - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash And Cash Equivalents [Abstract]        
Cash and cash equivalents $ 380 $ 196    
Restricted cash reported in Other current assets 7 7    
Restricted cash 64 53    
Total cash, cash equivalents and restricted cash shown in the Statement of Cash Flows $ 451 $ 256 $ 241 $ 290