Note 17 - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance as of January 1	$ 61	$ 84
Tax positions related to the current year:
Additions		7
Tax positions related to prior years:
Additions	1	6
Reductions	(5)	(28)
Settlements with taxing jurisdictions		(4)
Lapses in statute of limitations		(4)
Balance as of December 31	$ 57	$ 61

Tax Positions related to prior years:

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Tax positions related to the current year.

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Amount of unrecognized tax benefits.

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