Note 7 - Available-for-Sale Investments (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended			12 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Available For Sale Investments [Text Block]
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	$ 41	[1]
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount	6			9
Proceeds from Sale of Short-term Investments	$ 1,020		$ 989

[1] Includes $41 million of asset-backed securities that mature over time and are being reported at their final maturity dates.