Employee Benefit Obligations (Tables)

9 Months Ended

Sep. 30, 2011

Employee Benefit Obligations

Schedule Of Defined Benefit Plans Disclosures

	Three Months Ended September 30, 2011								Three Months Ended September 30, 2010
	Qualified pension plans(a)			Non- Qualified pension plans		Other Post- Retirement Benefit plans(b)			Qualified pension plans(a)			Non- Qualified pension plans		Other Post- Retirement Benefit plans(b)
	(in millions)
Service cost	$	24		$	—	$	1		$	24		$	—	$	1
Interest cost on benefit obligation		58			2		8			62			2		9
Expected return on plan assets		(96	)		—		(3	)		(94	)		—		(3	)
Amortization of prior service cost (credit)		1			—		(2	)		1			1		(2	)
Amortization of net transition liability		—			—		2			—			—		4
Amortization of loss (gain)		20			1		—			12			—		(2	)
Other		4			—		—			5			—		—
Net periodic costs	$	11		$	3	$	6		$	10		$	3	$	7

(a) Excludes regulatory asset amortization of $4 million for each of the three months ended September 30, 2011 and 2010, resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006.

(b) Excludes regulatory asset amortization of $2 million for each of the three months ended September 30, 2011 and 2010, resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006.

	Nine Months Ended September 30, 2011								Nine Months Ended September 30, 2010
	Qualified pension plans(a)			Non- Qualified pension plans		Other Post- Retirement Benefit plans(b)			Qualified pension plans(a)			Non- Qualified pension plans		Other Post- Retirement Benefit plans(b)
	(in millions)
Service cost	$	72		$	1	$	5		$	72		$	1	$	5
Interest cost on benefit obligation		174			6		26			186			6		29
Expected return on plan assets		(288	)		—		(11	)		(283	)		—		(11	)
Amortization of prior service cost (credit)		4			1		(6	)		4			2		(6	)
Amortization of net transition liability		—			—		7			—			—		8
Amortization of loss (gain)		58			1		(2	)		37			—		(4	)
Contractual termination benefit cost		—			—		—			10			—		—
Other		13			—		—			14			—		—
Net periodic costs	$	33		$	9	$	19		$	40		$	9	$	21

(a) Excludes regulatory asset amortization of $11 million and $12 million for the nine months ended September 30, 2011 and 2010, respectively, resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006.

(b) Excludes regulatory asset amortization of $6 million and $7 million for the nine months ended September 30, 2011 and 2010, respectively, resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006.