Note 7 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
US Government Agencies Debt Securities [Member]
Bonds, notes and other securities:
Amortized cost	$ 743	$ 530
Fair value	744	531
Equity Securities [Member]
Bonds, notes and other securities:
Amortized cost	6
Fair value	7
Total Short-Term Investments [Member]
Bonds, notes and other securities:
Amortized cost	749	530
Fair value	751	531
Asset-backed Securities [Member]
Bonds, notes and other securities:
Amortized cost	43	46
Fair value	38	38
Total Long-Term Investments [Member]
Bonds, notes and other securities:
Amortized cost	43	46
Fair value	$ 38	$ 38