Note 13 - Revision to Prior Period Financial Statements (Details) - Revisions to Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013		Dec. 31, 2012
Current assets
Regulatory assets	$ 165	[1]	$ 114	[1]	$ 74	[1]
Other	121		118		69
Total current assets	2,384	[1]	2,895	[1]	2,231	[1]
Long-term assets and other deferred debits
Property, plant and equipment	11,188		10,938		10,599
Less accumulated depreciation	2,400		2,295		2,240
Property, plant and equipment, net	8,788		8,643		8,359
Regulatory assets	726	[1]	705	[1]	880	[1]
Intangible assets	135		145		158
Other	312		315		241
Total long-term assets and other deferred debits	11,797		11,655		11,477
Total assets	14,181	[1]	14,550	[1]	13,708	[1]
Current liabilities
Accrued expenses	213		203		163
Total current liabilities	2,595	[1]	3,118	[1]	2,348	[1]
Long-term liabilities and other deferred credits
Accumulated deferred income taxes	1,675		1,628		1,534
Total long-term liabilities and other deferred credits	7,726	[1]	7,819	[1]	7,858	[1]
Total liabilities and other deferred credits	10,321	[1]	10,937	[1]	10,206	[1]
Equity
Additional paid-in capital	2,073		2,054		2,037
Retained earnings	1,288		1,063		1,072
Total equity	3,860	[1]	3,613	[1]	3,502	[1]	3,391
Total liabilities and equity	14,181	[1]	14,550	[1]	13,708	[1]
Scenario, Previously Reported [Member]
Current assets
Regulatory assets	211	[2]			120	[2]
Other	122	[2]			69	[2]
Total current assets	2,431	[2]			2,277	[2]
Long-term assets and other deferred debits
Property, plant and equipment	11,202	[2]			10,613	[2]
Less accumulated depreciation	2,401	[2]			2,240	[2]
Property, plant and equipment, net	8,801	[2]			8,373	[2]
Regulatory assets	775	[2]			898	[2]
Intangible assets	147	[2]			164	[2]
Other	312	[2]			244	[2]
Total long-term assets and other deferred debits	11,871	[2]			11,518	[2]
Total assets	14,302	[2]			13,795	[2]
Current liabilities
Accrued expenses	213	[2]			164	[2]
Total current liabilities	2,596	[2]			2,349	[2]
Long-term liabilities and other deferred credits
Accumulated deferred income taxes	1,721	[2]			1,567	[2]
Total long-term liabilities and other deferred credits	7,772	[2]			7,891	[2]
Total liabilities and other deferred credits	10,368	[2]			10,240	[2]
Equity
Additional paid-in capital	2,072	[2]			2,035	[2]
Retained earnings	1,363	[2]			1,127	[2]
Total equity	3,934	[2]			3,555	[2]
Total liabilities and equity	$ 14,302	[2]			$ 13,795	[2]

[1] Amounts revised to include prior period adjustments. See Note 13 for additional information.

[2] Reflects the reclassification of the Tropical Shipping amounts as held for sale, as filed in our Original Filing.