Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
US Government Agencies Debt Securities [Member]
Bonds, notes and other securities:
Amortized cost	$ 758	$ 530
Fair value	759	531
Equity Securities [Member]
Bonds, notes and other securities:
Amortized cost	6
Fair value	9
Total Short-Term Investments [Member]
Bonds, notes and other securities:
Amortized cost	764	530
Fair value	768	531
Asset-backed Securities [Member]
Bonds, notes and other securities:
Amortized cost	44	46
Fair value	39	38
Total Long-Term Investments [Member]
Bonds, notes and other securities:
Amortized cost	44	46
Fair value	$ 39	$ 38