Note 10 - Non-Wholly Owned Entities (Detail) - Variable Interest Entities (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Current assets	$ 2,668		$ 2,746
Long-term assets and other deferred debit	11,473		11,167
Total assets	14,141		13,913
Current liabilities	3,338		3,084
Long-term liabilities and other deferred credits	7,368		7,490
Total Liabilities	10,706		10,574
Equity	3,435		3,339		1,836	1,819
Total liabilities and equity	14,141		13,913
South Star [Member]
Current assets	201	[1]	210	[1]
Long-term assets and other deferred debit	10	[1]	9	[1]
Total assets	211	[1]	219	[1]
Current liabilities	62	[1]	77	[1]
Long-term liabilities and other deferred credits	0	[1]	0	[1]
Total Liabilities	62	[1]	77	[1]
Equity	149	[1]	142	[1]
Total liabilities and equity	$ 211	[1]	$ 219	[1]
South Star Percentage To Consolidated [Member]
Current assets	8.00%	[2]	8.00%	[2]
Long-term assets and other deferred debit	0.00%	[2]	0.00%	[2]
Total assets	1.00%	[2]	2.00%	[2]
Current liabilities	2.00%	[2]	2.00%	[2]
Long-term liabilities and other deferred credits	0.00%	[2]	0.00%	[2]
Total Liabilities	1.00%	[2]	1.00%	[2]
Equity	4.00%	[2]	4.00%	[2]
Total liabilities and equity	1.00%	[2]	2.00%	[2]

[1] These amounts reflect information for SouthStar and do not include intercompany eliminations and the balances of our wholly owned subsidiary with an 85% ownership interest in SouthStar.

[2] SouthStar's percentage of the amount on our Consolidated Statements of Financial Position.