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Note 3 - Available-for-Sale Investments (Tables) | 12 Months Ended
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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)

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- Definition The tabular disclosure of fair value and gross unrealized losses of investments by category and length of time in continuous unrealized loss position. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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