Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
U.S. Government and Agencies [Member]
Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]
Amortized cost	$ 868	$ 1,153
Fair value	870	1,156
Total Short-Term Investments [Member]
Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]
Amortized cost	868	1,153
Fair value	870	1,156
Asset-backed Securities [Member]
Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]
Amortized cost	48	51
Fair value	41	40
Total Long-Term Investments [Member]
Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]
Amortized cost	48	51
Fair value	$ 41	$ 40