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Note 2 - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Restricted Cash And Cash Equivalents Items [Line Items]    
Cash and cash equivalents $ 275 $ 344
Long-term restricted cash 11 17
Total cash, cash equivalents and restricted cash shown in the Statement of Cash Flows 293 369
Other Current Assets [Member]    
Restricted Cash And Cash Equivalents Items [Line Items]    
Restricted cash included in Other current assets $ 7 $ 8