Goodwill (Tables)

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Finite-Lived Intangible Assets [Line Items]

Goodwill By Reportable Operating Segment

Goodwill
	The following tables present goodwill by reportable operating segment for Duke Energy and Duke Energy Ohio.
Duke Energy
(in millions)		USFE&G		Commercial Power		International Energy		Total
Balance at 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
Acquisitions (a)			12,467		―		59		12,526
Foreign exchange and other changes			―		(7)		(3)		(10)
Balance at December 31, 2012:
Goodwill			15,950		933		353		17,236
Accumulated impairment charges			―		(871)		―		(871)
Balance at December 31, 2012, as adjusted for accumulated impairment charges		$	15,950	$	62	$	353	$	16,365
(a)	USFE&G amount relates to the merger with Progress Energy. International Energy amount relates to the Ibener acquisition. See Note 2 for further information.

Schedule of Intangible Assets

	December 31, 2012
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Emission allowances	$	80	$	24	$	29
Gas, coal and power contracts		295		272		24
Wind development rights		111		―		―
Other		109		10		―
Total gross carrying amounts		595		306		53
Accumulated amortization - gas, coal and power contracts		(180)		(168)		(12)
Accumulated amortization - wind development rights		(9)		―		―
Accumulated amortization - other		(34)		(9)		―
Total accumulated amortization		(223)		(177)		(12)
Total intangible assets, net	$	372	$	129	$	41

	December 31, 2011
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Emission allowances	$	66	$	29	$	37
Gas, coal and power contracts		295		271		24
Wind development rights		137		―		―
Other		72		10		―
Total gross carrying amounts		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

Schedule of Carrying Value of Emission Allowance

		Year Ended December 31, 2012
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Gross carrying value at beginning of period	$	66	$	29	$	37
Amounts acquired in Progress Energy merger		29		―
Purchases of emission allowances		―		―		―
Sales and consumption of emission allowances(a)(b)		(15)		(5)		(8)
Gross carrying value at end of period	$	80	$	24	$	29

		December 31, 2011
(in millions)			Duke Energy		Duke Energy Ohio		Duke Energy Indiana
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
(a)	Carrying value of emission allowances are recognized via a charge to expense when consumed.
(b)	See Note 2 for additional information regarding gains and losses on sales of emission allowances by USFE&G and Commercial Power.

Schedule of Amortization Expense

	The following table presents amortization expense for gas, coal and power contracts, wind development rights and other intangible
assets.
		December 31,
(in millions)			2012		2011		2010
Duke Energy		$	14	$	10	$	24
Duke Energy Ohio			12		8		20
Duke Energy Indiana			1		1		1

Schedule of Expected Amortization Expense

(in millions)		2013		2014		2015		2016		2017
Duke Energy	$	45	$	19	$	17	$	16	$	15
Duke Energy Ohio		8		13		10		10		9
Duke Energy Indiana		30		1		1		1		1

Duke Energy Ohio [Member]

Finite-Lived Intangible Assets [Line Items]

Goodwill By Reportable Operating Segment

Duke Energy Ohio
(in millions)	Franchised Electric & Gas		Commercial Power		Total
Balance at December 31, 2011:
Goodwill	$	1,137	$	1,188	$	2,325
Accumulated impairment charges		(216)		(1,188)		(1,404)
Balance at December 31, 2011, as adjusted for accumulated impairment charges		921		―		921
Balance at December 31, 2012:
Goodwill		1,137		1,188		2,325
Accumulated impairment charges		(216)		(1,188)		(1,404)
Balance at December 31, 2012, as adjusted for accumulated impairment charges	$	921	$	―	$	921

Schedule of Intangible Assets

	December 31, 2012
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Emission allowances	$	80	$	24	$	29
Gas, coal and power contracts		295		272		24
Wind development rights		111		―		―
Other		109		10		―
Total gross carrying amounts		595		306		53
Accumulated amortization - gas, coal and power contracts		(180)		(168)		(12)
Accumulated amortization - wind development rights		(9)		―		―
Accumulated amortization - other		(34)		(9)		―
Total accumulated amortization		(223)		(177)		(12)
Total intangible assets, net	$	372	$	129	$	41

	December 31, 2011
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Emission allowances	$	66	$	29	$	37
Gas, coal and power contracts		295		271		24
Wind development rights		137		―		―
Other		72		10		―
Total gross carrying amounts		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

Schedule of Carrying Value of Emission Allowance

		Year Ended December 31, 2012
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Gross carrying value at beginning of period	$	66	$	29	$	37
Amounts acquired in Progress Energy merger		29		―
Purchases of emission allowances		―		―		―
Sales and consumption of emission allowances(a)(b)		(15)		(5)		(8)
Gross carrying value at end of period	$	80	$	24	$	29

		December 31, 2011
(in millions)			Duke Energy		Duke Energy Ohio		Duke Energy Indiana
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
(a)	Carrying value of emission allowances are recognized via a charge to expense when consumed.
(b)	See Note 2 for additional information regarding gains and losses on sales of emission allowances by USFE&G and Commercial Power.

Schedule of Amortization Expense

	The following table presents amortization expense for gas, coal and power contracts, wind development rights and other intangible
assets.
		December 31,
(in millions)			2012		2011		2010
Duke Energy		$	14	$	10	$	24
Duke Energy Ohio			12		8		20
Duke Energy Indiana			1		1		1

Schedule of Expected Amortization Expense

(in millions)		2013		2014		2015		2016		2017
Duke Energy	$	45	$	19	$	17	$	16	$	15
Duke Energy Ohio		8		13		10		10		9
Duke Energy Indiana		30		1		1		1		1

Duke Energy Indiana [Member]

Finite-Lived Intangible Assets [Line Items]

Schedule of Intangible Assets

	December 31, 2012
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Emission allowances	$	80	$	24	$	29
Gas, coal and power contracts		295		272		24
Wind development rights		111		―		―
Other		109		10		―
Total gross carrying amounts		595		306		53
Accumulated amortization - gas, coal and power contracts		(180)		(168)		(12)
Accumulated amortization - wind development rights		(9)		―		―
Accumulated amortization - other		(34)		(9)		―
Total accumulated amortization		(223)		(177)		(12)
Total intangible assets, net	$	372	$	129	$	41

	December 31, 2011
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Emission allowances	$	66	$	29	$	37
Gas, coal and power contracts		295		271		24
Wind development rights		137		―		―
Other		72		10		―
Total gross carrying amounts		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

Schedule of Carrying Value of Emission Allowance

		Year Ended December 31, 2012
(in millions)		Duke Energy		Duke Energy Ohio		Duke Energy Indiana
Gross carrying value at beginning of period	$	66	$	29	$	37
Amounts acquired in Progress Energy merger		29		―
Purchases of emission allowances		―		―		―
Sales and consumption of emission allowances(a)(b)		(15)		(5)		(8)
Gross carrying value at end of period	$	80	$	24	$	29

		December 31, 2011
(in millions)			Duke Energy		Duke Energy Ohio		Duke Energy Indiana
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
(a)	Carrying value of emission allowances are recognized via a charge to expense when consumed.
(b)	See Note 2 for additional information regarding gains and losses on sales of emission allowances by USFE&G and Commercial Power.

Schedule of Amortization Expense

	The following table presents amortization expense for gas, coal and power contracts, wind development rights and other intangible
assets.
		December 31,
(in millions)			2012		2011		2010
Duke Energy		$	14	$	10	$	24
Duke Energy Ohio			12		8		20
Duke Energy Indiana			1		1		1

Schedule of Expected Amortization Expense

(in millions)		2013		2014		2015		2016		2017
Duke Energy	$	45	$	19	$	17	$	16	$	15
Duke Energy Ohio		8		13		10		10		9
Duke Energy Indiana		30		1		1		1		1