Note 16 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		Fair value measurements at reporting date using
(in millions)	December 31, 2015	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
Current assets:
Short-term investments	$100	$100
Other current assets (1)	$522		$522
Non-current assets:
Other assets (1)(2)	$752		$506	$246
Current liabilities:
Other accrued liabilities (1)	$   55		$  55
Non-current liabilities:
Other liabilities (1)(2)	$   98		$  88	$  10

		Fair value measurements at reporting date using
(in millions)	December 31, 2014	Quoted prices in active markets for identical assets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)
Current assets:
Short-term investments	$   759	$759
Other current assets (1)	$   687		$687
Non-current assets:
Other assets (1)(2)	$1,330		$885	$445
Current liabilities:
Other accrued liabilities (1)	$      44		$  44
Non-current liabilities:
Other liabilities (1)	$      15		$  15

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Level 3 Roll-Forward – Other Assets
(in millions)		2015	2014
Beginning balance		$445	$196
Unrealized gains (loss)		13	249
Transfer in (out) of level 3		(212)
Ending balance		$246	$445