Note 2 - Significant Accounting Policies and Methods of Application (Detail) - Investments in Debt and Equity Securities (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Marketable Securities	$ 79		$ 72		$ 0
Money Market Funds [Member]
Marketable Securities	69	[1]	59	[1]	0	[1]
Corporate Bond Securities [Member]
Marketable Securities	6	[2]	6	[2]	0	[2]
Other Investments [Member]
Marketable Securities	4	[2]	7	[2]	0	[2]
Cash and Cash Equivalents [Member]
Marketable Securities	10		9		0
Short-term Investments [Member]
Marketable Securities	60		53		0
Other Long-Term Assets and Other Deferred Debits [Member]
Marketable Securities	$ 9		$ 10		$ 0

[1] Categorized as trading.

[2] Categorized as held-to-maturity.