Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Property, Plant And Equipment [Abstract]

Schedule Of Property, Plant And Equipment

	December 31, 2011
	Estimated Useful Life	Duke Energy			Duke Energy Carolinas			Duke Energy Ohio			Duke Energy Indiana
	(Years)	(in millions)
Land	—	$	745		$	372		$	135		$	88
Plant—Regulated
Electric generation, distribution and transmission(a)	8 – 125		38,330			26,466			3,595			8,269
Natural gas transmission and distribution(a)	12 – 60		1,927			—			1,927			—
Other buildings and improvements(a)	25 – 100		672			428			106			138
Plant—Unregulated
Electric generation, distribution and transmission(a)	8 – 100		5,464			—			3,997			—
Other buildings and improvements(a)	18 – 40		2,095			—			192			—
Nuclear fuel	—		1,213			1,213			—			—
Equipment(a)	3 – 33		863			248			168			134
Construction in process(a)	—		7,664			3,774			255			2,992
Other(a)	5 – 33		2,477			499			257			170
Total property, plant and equipment			61,450			33,000			10,632			11,791
Total accumulated depreciation—regulated(b),(c)			(16,630	)		(11,349	)		(1,916	)		(3,393	)
Total accumulated depreciation—unregulated(c)(d)			(2,159	)		—			(678	)		—
Total net property, plant and equipment		$	42,661		$	21,651		$	8,038		$	8,398

(a) Includes capitalized leases of $444 million, $53 million, $82 million, and $33 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio, and Duke Energy Indiana, respectively.

(b) Includes $578 million of accumulated amortization of nuclear fuel at Duke Energy and Duke Energy Carolinas.

(c) Includes accumulated amortization of capitalized leases of $28 million, an insignificant amount, $11 million and $6 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio, and Duke Energy Indiana, respectively.

(d) Includes accumulated depreciation of VIEs of $62 million at December 31, 2011 at Duke Energy.

	December 31, 2010
	Estimated Useful Life	Duke Energy			Duke Energy Carolinas			Duke Energy Ohio			Duke Energy Indiana
	(Years)	(in millions)
Land(a)	—	$	743		$	357		$	133		$	89
Plant—Regulated
Electric generation, distribution and transmission(a)	8 – 125		36,744			24,980			3,483			8,282
Natural gas transmission and distribution(a)	12 – 60		1,815			—			1,815			—
Other buildings and improvements(a)	25 – 100		610			366			111			132
Plant—Unregulated
Electric generation, distribution and transmission(a)	8 – 100		5,256			—			3,960			—
Other buildings and improvements(a)	20 – 90		2,108			1			188			—
Nuclear fuel	—		1,176			1,176			—			—
Equipment(a)	3 – 33		718			166			147			128
Construction in process(a)	—		7,015			3,677			182			2,426
Other(a)	5 – 33		2,354			468			240			156
Total property, plant and equipment			58,539			31,191			10,259			11,213
Total accumulated depreciation—regulated(b),(c)			(16,273	)		(11,126	)		(1,832	)		(3,341	)
Total accumulated depreciation—unregulated(c)(d)			(1,922	)		—			(579	)		—
Total net property, plant and equipment		$	40,344		$	20,065		$	7,848		$	7,872

(a) Includes capitalized leases of $414 million, $134 million, and $53 million at Duke Energy, Duke Energy Ohio, and Duke Energy Indiana, respectively.

(b) Includes $667 million of accumulated amortization of nuclear fuel at Duke Energy and Duke Energy Carolinas.

(c) Includes accumulated amortization of capitalized leases of $31 million, $17 million and $10 million at Duke Energy, Duke Energy Ohio, and Duke Energy Indiana, respectively.

(d) Includes accumulated depreciation of VIEs of $45 million at December 31, 2010 at Duke Energy.

Schedule Of Capitalized Interest

	Years Ended December 31,
	2011		2010		2009
	(in millions)
Duke Energy	$	166	$	167	$	102
Duke Energy Carolinas		78		83		65
Duke Energy Ohio		9		8		4
Duke Energy Indiana		33		19		13