Merger (Tables)

6 Months Ended

Jun. 30, 2012

Merger Disclosure [Line Items]

Interim firm sales of capacity and energy [Tables]

MW per hour	Duke Energy Carolinas	PEC	Duke Energy
Summer off-peak	300	500	800
Summer on-peak	150	325	475
Winter off-peak	225	0	225
Winter on-peak	25	0	25

Exit cost liabilities [Tables]

(in millions)
Balance, December 31, 2011		$	5
Additional exit cost recognized			3
Balance, March 31, 2012			8
Additional exit cost recognized(a)			2
Balance, June 30, 2012(b)		$	10
(a)	PEC and PEF recognized exit costs of $1 million each for the three months ended June 30, 2012, and $3 million and $2 million, respectively, for the six months ended June 30, 2012.
(b)	Expense related to the recognition of the cumulative exit cost liability at June 30, 2012, was attributed to PEC and PEF totaling $7 million and $3 million, respectively.

Merger and integration costs [Tables]

	Three months ended June 30				Six months ended June 30
(in millions)	2012		2011		2012		2011
Progress Energy	$	13	$	7	$	18	$	21
PEC		7		4		11		11
PEF		6		3		7		10

PEC

Merger Disclosure [Line Items]

Interim firm sales of capacity and energy [Tables]

MW per hour	Duke Energy Carolinas	PEC	Duke Energy
Summer off-peak	300	500	800
Summer on-peak	150	325	475
Winter off-peak	225	0	225
Winter on-peak	25	0	25

Exit cost liabilities [Tables]

(in millions)
Balance, December 31, 2011		$	5
Additional exit cost recognized			3
Balance, March 31, 2012			8
Additional exit cost recognized(a)			2
Balance, June 30, 2012(b)		$	10
(a)	PEC and PEF recognized exit costs of $1 million each for the three months ended June 30, 2012, and $3 million and $2 million, respectively, for the six months ended June 30, 2012.
(b)	Expense related to the recognition of the cumulative exit cost liability at June 30, 2012, was attributed to PEC and PEF totaling $7 million and $3 million, respectively.

Merger and integration costs [Tables]

	Three months ended June 30				Six months ended June 30
(in millions)	2012		2011		2012		2011
Progress Energy	$	13	$	7	$	18	$	21
PEC		7		4		11		11
PEF		6		3		7		10

PEF

Merger Disclosure [Line Items]

Exit cost liabilities [Tables]

(in millions)
Balance, December 31, 2011		$	5
Additional exit cost recognized			3
Balance, March 31, 2012			8
Additional exit cost recognized(a)			2
Balance, June 30, 2012(b)		$	10
(a)	PEC and PEF recognized exit costs of $1 million each for the three months ended June 30, 2012, and $3 million and $2 million, respectively, for the six months ended June 30, 2012.
(b)	Expense related to the recognition of the cumulative exit cost liability at June 30, 2012, was attributed to PEC and PEF totaling $7 million and $3 million, respectively.

Merger and integration costs [Tables]

	Three months ended June 30				Six months ended June 30
(in millions)	2012		2011		2012		2011
Progress Energy	$	13	$	7	$	18	$	21
PEC		7		4		11		11
PEF		6		3		7		10