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Note 6 - Available-for-Sale Investments
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
6.      Available-for-Sale Investments

The following is a summary of the fair value of available-for-sale investments (in millions):

 
Amortized cost
 
Fair value
 
September 30,
2015
 
December 31,
2014
 
September 30,
2015
 
December 31,
2014
Bonds, notes and other securities:
                     
U.S. government and agencies
$
573
 
$
759
 
$
573
 
$
759
Total short-term investments
$
573
 
$
759
 
$
573
 
$
759
Asset-backed securities
$
39
 
$
42
 
$
35
 
$
38
Total long-term investments
$
39
 
$
42
 
$
35
 
$
38

We do not intend to sell, nor do we believe it is more likely than not that we would be required to sell, the long-term investment asset-backed securities (which are collateralized by mortgages) before recovery of their amortized cost basis.  It is possible that a significant degradation in the delinquency or foreclosure rates in the underlying assets could cause further temporary or other-than-temporary impairments in the future.

The following table summarizes the contractual maturities of available-for-sale securities at September 30, 2015 (in millions):

Less than one year
$545
Due in 1-5 years
28
Due in 5-10 years
 
Due after 10 years (1)
35
Total
$608

(1)
Includes $35 million of asset-based securities that mature over time and are being reported at their final maturity dates.

For the nine months ended September 30, 2015 and 2014, proceeds from sales and maturities of short-term investments each totaled approximately $1.0 billion.