Note 19 - Reconciliation of Beginning and Ending Balances of Assets Measured With Significant Unobservable Inputs (Details) - Major US Plans [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]
Fair value of plan assets at beginning of period	$ 3,804
Fair value of plan assets at end of period	3,445	$ 3,804
Real Estate [Member]
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]
Fair value of plan assets at beginning of period	94
Fair value of plan assets at end of period	57	94
Private Equity Funds [Member]
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]
Fair value of plan assets at beginning of period	615
Fair value of plan assets at end of period	665	615
Fair Value, Inputs, Level 3 [Member]
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]
Fair value of plan assets at beginning of period	40	46
Net Realized and Unrealized Gains Relating to Assets Still Held	1	8
Net Realized and Unrealized Gains Relating to Assets Sold During the Period	14
Net Purchases, Sales and Settlements	(49)	(14)
Fair value of plan assets at end of period	6	40
Fair Value, Inputs, Level 3 [Member] \| Real Estate [Member]
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]
Fair value of plan assets at beginning of period	26	32
Net Realized and Unrealized Gains Relating to Assets Still Held		5
Net Realized and Unrealized Gains Relating to Assets Sold During the Period	14
Net Purchases, Sales and Settlements	(40)	(11)
Fair value of plan assets at end of period		26
Fair Value, Inputs, Level 3 [Member] \| Private Equity Funds [Member]
Pension Income Expense from Continuing and Discontinued Operations for Major Defined Benefit Plans [Line Items]
Fair value of plan assets at beginning of period	14	14
Net Realized and Unrealized Gains Relating to Assets Still Held	1	3
Net Purchases, Sales and Settlements	(9)	(3)
Fair value of plan assets at end of period	$ 6	$ 14

Retirement plans details reconciliation of assets measured with significant unobservable inputs.

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

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