Goodwill, Intangible Assets And Impairments (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Goodwill, Intangible Assets And Impairments [Abstract]

Goodwill By Reportable Operating Segment

	USFE&G		Commercial Power			International Energy			Total
	(in millions)
Duke Energy
Balance at December 31, 2010:
Goodwill	$	3,483	$	940		$	306		$	4,729
Accumulated Impairment Charges		—		(871	)		—			(871	)
Balance at December 31, 2010, as adjusted for accumulated impairment charges		3,483		69			306			3,858
Foreign Exchange and Other Changes		—		—			(9	)		(9	)
Balance as of December 31, 2011:
Goodwill		3,483		940			297			4,720
Accumulated Impairment Charges		—		(871	)		—			(871	)
Balance at December 31, 2011, as adjusted for accumulated impairment charges	$	3,483	$	69		$	297		$	3,849

Intangible Assets

	December 31, 2011
	Duke Energy			Duke Energy Ohio			Duke Energy Indiana
	(in millions)
Emission allowances	$	66		$	29		$	37
Gas, coal and power contracts		295			271			24
Wind development rights		137			—			—
Other		72			10			—
Total gross carrying amount		570			310			61
Accumulated amortization—gas, coal and power contracts		(169	)		(158	)		(11	)
Accumulated amortization—wind development rights		(7	)		—			—
Accumulated amortization—other		(31	)		(9	)		—
Total accumulated amortization		(207	)		(167	)		(11	)
Total intangible assets, net	$	363		$	143		$	50

	December 31, 2010
	Duke Energy			Duke Energy Ohio			Duke Energy Indiana
	(in millions)
Emission allowances	$	175		$	125		$	49
Gas, coal and power contracts		295			271			24
Wind development rights		119			—			—
Other		71			9			—
Total gross carrying amount		660			405			73
Accumulated amortization—gas, coal and power contracts		(157	)		(148	)		(9	)
Accumulated amortization—wind development rights		(5	)		—			—
Accumulated amortization—other		(31	)		(9	)		—
Total accumulated amortization		(193	)		(157	)		(9	)
Total intangible assets, net	$	467		$	248		$	64

Schedule Of Carrying Value Of Emission Allowances

	December 31, 2011
	Duke Energy			Duke Energy Ohio			Duke Energy Indiana
	(in millions)
Gross carrying value at beginning of period	$	175		$	125		$	49
Purchases of emission allowances		4			1			2
Sales and consumption of emission allowances(a)(b)		(39	)		(18	)		(21	)
Impairment of emission allowances		(79	)		(79	)		—
Other changes		5			—			7
Gross carrying value at end of period	$	66		$	29		$	37
	December 31, 2010
	Duke Energy			Duke Energy Ohio			Duke Energy Indiana
	(in millions)
Gross carrying value at beginning of period	$	274		$	191		$	82
Purchases of emission allowances		14			12			1
Sales and consumption of emission allowances(a)(b)		(66	)		(31	)		(34	)
Other changes		(47	)		(47	)		—
		—			—			—
Gross carrying value at end of period	$	175		$	125		$	49

(a) Carrying value of emission allowances are recognized via a charge to expense when consumed.

(b) See Note 3 for a discussion of gains and losses on sales of emission allowances by USFE&G and Commercial Power.

Schedule Of Amortization Expense

	2011		2010		2009
	(in millions)
Duke Energy	$	10	$	24	$	25
Duke Energy Ohio		8		20		23
Duke Energy Indiana		1		1		1

Schedule Of Future Amortization Expense

	2012		2013		2014		2015		2016
	(in millions)
Duke Energy	$	60	$	17	$	17	$	16	$	16
Duke Energy Ohio		16		11		10		10		9
Duke Energy Indiana		38		1		1		1		1