Note 16 - 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, 2016	Dec. 31, 2015
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]
Fair value of plan assets at beginning of period	$ 3,793
Fair value of plan assets at end of period	3,653	$ 3,793
Real Estate [Member]
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]
Fair value of plan assets at beginning of period	130
Fair value of plan assets at end of period	116	130
Private Equity Funds [Member]
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]
Fair value of plan assets at beginning of period	768
Fair value of plan assets at end of period	659	768
Fair Value, Inputs, Level 3 [Member]
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]
Fair value of plan assets at beginning of period	58	69
Net Realized and Unrealized Gains/(Losses)	1	7
Net Purchases and Sales	(13)	(18)
Fair value of plan assets at end of period	46	58
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]
Fair value of plan assets at beginning of period	34	41
Net Realized and Unrealized Gains/(Losses)	7	6
Net Purchases and Sales	(9)	(13)
Fair value of plan assets at end of period	32	34
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Reconciliation Of Assets Measured With Significant Unobservable Inputs [Line Items]
Fair value of plan assets at beginning of period	24	28
Net Realized and Unrealized Gains/(Losses)	(6)	1
Net Purchases and Sales	(4)	(5)
Fair value of plan assets at end of period	$ 14	$ 24