Note 3 - Available-for-Sale Investments (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	Amortized cost December 31,				Fair value December 31,
	2015		2014		2015		2014
Bonds, notes and other securities:
U.S. government and agencies	$	100	$	759	$	100	$	759
Total short-term investments	$	100	$	759	$	100	$	759
Asset-backed securities	$	37	$	42	$	33	$	38
Total long-term investments	$	37	$	42	$	33	$	38

Investments Classified by Contractual Maturity Date [Table Text Block]

Less than one year	$  70
Due in 1-5 years	30
Due in 5-10 years
Due after 10 years	33
Total	$133

Schedule of Fair Value and Gross Unrealized Losses of Investments by Category and Length of Time in Continuous Unrealized Loss Position [Table Text Block]

(in millions)	Number of securities  in a loss position	December 31, 2015
		12 months or greater				Total
		Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	21	$	33	$	(4)	$	33	$	(4)
Total long-term investments	21	$	33	$	(4)	$	33	$	(4)

(in millions)	Number of securities  in a loss position	December 31, 2014
		12 months or greater				Total
		Fair value		Unrealized losses (1)		Fair value		Unrealized losses
Asset-backed securities	21	$	37	$	(4)	$	37	$	(4)
Total long-term investments	21	$	37	$	(4)	$	37	$	(4)