Note 13 - Revision to Prior Period Financial Statements (Details) - Revisions to Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013		Dec. 31, 2012
Current assets
Regulatory assets	$ 250	[1]	$ 114	[1]	$ 72	[1]
Other	127		118		93
Total current assets	3,589	[1],[2]	2,895	[1],[2]	2,530	[1],[2]
Long-term assets and other deferred debits
Property, plant and equipment	11,054		10,938		10,450
Less accumulated depreciation	2,367		2,295		2,181
Property, plant and equipment, net	8,687		8,643		8,269
Regulatory assets	696	[1]	705	[1]	868	[1]
Intangible assets	140		145		131
Other	314		315		231
Total long-term assets and other deferred debits	11,675		11,655		11,332
Total assets	15,264	[1],[2]	14,550	[1],[2]	13,862	[1],[2]
Current liabilities
Accrued expenses	385		203		161
Total current liabilities	3,754	[1],[2]	3,118	[1],[2]	3,059	[1],[2]
Long-term liabilities and other deferred credits
Accumulated deferred income taxes	1,655		1,628		1,539
Total long-term liabilities and other deferred credits	7,667	[1],[2]	7,819	[1],[2]	7,310	[1],[2]
Total liabilities and other deferred credits	11,421	[1],[2]	10,937	[1],[2]	10,369	[1],[2]
Equity
Additional paid-in capital	2,060		2,054		2,020
Retained earnings	1,289		1,063		1,085
Total equity	3,843	[1],[2]	3,613	[1],[2]	3,493	[1],[2]	3,391
Total liabilities and equity	15,264	[1],[2]	14,550	[1],[2]	13,862	[1],[2]
Scenario, Previously Reported [Member]
Current assets
Regulatory assets	297	[3]			119	[3]
Other	127	[3]			95	[3]
Total current assets	3,637	[3]			2,577	[3]
Long-term assets and other deferred debits
Property, plant and equipment	11,068	[3]			10,463	[3]
Less accumulated depreciation	2,368	[3]			2,181	[3]
Property, plant and equipment, net	8,700	[3]			8,282	[3]
Regulatory assets	736	[3]			878	[3]
Intangible assets	151	[3]			136	[3]
Other	319	[3]			245	[3]
Total long-term assets and other deferred debits	11,739	[3]			11,363	[3]
Total assets	15,376	[3]			13,940	[3]
Current liabilities
Accrued expenses	390	[3]			162	[3]
Total current liabilities	3,753	[3]			3,060	[3]
Long-term liabilities and other deferred credits
Accumulated deferred income taxes	1,699	[3]			1,568	[3]
Total long-term liabilities and other deferred credits	7,711	[3]			7,339	[3]
Total liabilities and other deferred credits	11,465	[3]			10,399	[3]
Equity
Additional paid-in capital	2,059	[3]			2,019	[3]
Retained earnings	1,358	[3]			1,134	[3]
Total equity	3,911	[3]			3,541	[3]
Total liabilities and equity	$ 15,376	[3]			$ 13,940	[3]

[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. See Note 12 for additional information.

[3] Reflects the reclassification of the Tropical Shipping amounts as held for sale.