Note 17 - Income Taxes (Details Textual) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Income Taxes [Line Items]
Operating Loss Carryforwards			$ 2,058
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration			866
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration			1,192
Deferred Tax Assets, Tax Credit Carryforwards, Foreign			358	$ 358
Accumulated Deferred Investment Tax Credit			$ 33
Operating Loss Carryforwards Limitations Minimum Ownership Change Percentage			50.00%
Operating Loss Carryforwards Limitations Ownership Change Period			3 years
Provision for tax on undistributed earnings including foreign withholding tax			$ 20	22
Deferred Tax Assets, Valuation Allowance			934	1,112
Deferred Tax Assets, Net of Valuation Allowance			162	1
Income Tax Examination, Penalties and Interest Accrued			11	14
Uncertain Tax Benefits			15	22
Valuation Allowance of Deferred Tax Assets [Member]
Schedule Of Income Taxes [Line Items]
Provision associated with establishment of valuation allowance on deferred tax assets		$ 167
Foreign Tax Authority [Member]
Schedule Of Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance			360	374
Deferred Tax Assets, Net of Valuation Allowance			351	364
Liability for Uncertain Tax Positions, Current			3		$ 3
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued			4		3
Unrecognized tax benefits, settlements paid	$ 4				$ 2
Domestic Tax Authority [Member]
Schedule Of Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance			574	738
Deferred Tax Assets, Net of Valuation Allowance			$ 554	717
Domestic Tax Authority [Member] | IRS [Member]
Schedule Of Income Taxes [Line Items]
Liability for Uncertain Tax Positions, Current				$ 41