Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended								3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended												3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012 PEF		Jun. 30, 2011 PEF		Jun. 30, 2012 MGP And Other Sites		Jun. 30, 2012 MGP And Other Sites		Jun. 30, 2011 MGP And Other Sites		Jun. 30, 2012 MGP And Other Sites PEC		Jun. 30, 2012 MGP And Other Sites PEC		Jun. 30, 2011 MGP And Other Sites PEC		Jun. 30, 2012 MGP And Other Sites PEF		Jun. 30, 2012 MGP And Other Sites PEF		Jun. 30, 2011 MGP And Other Sites PEF		Jun. 30, 2012 Remediation Of Distribution And Substation Transformers		Jun. 30, 2011 Remediation Of Distribution And Substation Transformers		Jun. 30, 2012 Remediation Of Distribution And Substation Transformers PEF		Jun. 30, 2011 Remediation Of Distribution And Substation Transformers PEF		Jun. 30, 2012 Orlando MGP OU1 PEF	Jun. 30, 2012 Orlando MGP OU1 PEF	Jun. 30, 2012 MGP Site PEC	Jun. 30, 2012 MGP Site PEC	Jun. 30, 2012 Ward Site PEC	Dec. 31, 2011 Ward Site PEC
Disclosure Environmental Matters Details [Line Items]
Beginning Balance	$ 23		$ 35		$ 12		$ 23				$ 17		$ 20				$ 11		$ 12				$ 6		$ 8		$ 6		$ 15		$ 6		$ 15
Amount accrued for environmental loss contingencies	17	[1]	3	[1]	13	[2]	3	[2]	12		15	[1]	0	[1]	5		4	[3]	0	[3]	7		11	[2]	0	[2]	2	[1]	3	[1]	2	[2]	3	[2]	6	9
Expenditures for environmental loss contingencies	(6)	[4]	(11)	[4]	(5)	[5]	(11)	[5]			(2)	[4]	(2)	[4]			(1)	[6]	0	[6]			(1)	[5]	(2)	[5]	(4)	[4]	(9)	[4]	(4)	[5]	(9)	[5]
Ending Balance	34	[7]	27	[7]	20	[7]	15	[7]	30	[7]	30	[7]	18	[7]	14	[8]	14	[8]	12	[8]	16	[7]	16	[7]	6	[7]	4	[7]	9	[7]	4	[7]	9	[7]
Environmental site recorded liability																																					7	7	5	5
Site contingency, loss exposure not accrued																																							6
Site contingency, loss exposure not accrued, reimbursement																																							1
Site contingency, loss exposure in excess of accrual, low estimate																																					2	2
Site contingency, loss exposure in excess of accrual, high estimate																																				$ 8	$ 25	$ 25

[1] Amounts accrued are for the six months ended June 30, 2012 and 2011. For the three months ended June 30, 2012, our accruals were $12 million for the remediation of MGP and other sites and were not material for the remediation of distribution and substations transformers. For the three months ended June 30, 2011, our accruals for environmental loss contingencies were not material.

[2] Amounts accrued are for the six months ended June 30, 2012 and 2011. For the three months ended June 30, 2012, PEF's accruals were $7 million for the remediation of MGP and other sites and were not material for the remediation of distribution and substation transformers. For the three months ended June 30, 2011, PEF's accruals for environmental loss contingencies were not material.

[3] Amounts accrued are for the six months ended June 30, 2012 and 2011. For the three months ended June 30, 2012, PEC's accruals were $5 million for the remediation of MGP and other sites. For the three months ended June 30, 2011, PEC's accruals for the remediation of MGP and other sites were not material.

[4] Expenditures are for the six months ended June 30, 2012 and 2011. For the three months ended June 30, 2012 and 2011, our expenditures for environmental loss contingencies were not material.

[5] Expenditures are for the six months ended June 30, 2012 and 2011. For the three months ended June 30, 2012 and 2011, PEF's expenditures for environmental loss contingencies were not material.

[6] Expenditures are for the six months ended June 30, 2012 and 2011. For the three months ended June 30, 2012 and 2011, PEC's expenditures for the remediation of MGP and other sites were not material.

[7] Expected to be paid out over one to 12 years.

[8] Expected to be paid out over one to ten years.