Business Segments (Tables)

12 Months Ended

Dec. 31, 2011

Business Segments [Abstract]

Business Segment Data

	Unaffiliated Revenues			Intersegment Revenues			Total Revenues			Segment  EBIT/ Consolidated Income from  Continuing Operations before Income Taxes			Depreciation  and Amortization		Capital and Investment Expenditures and Acquisitions		Segment Assets(b)
	(in millions)
Year Ended December 31, 2011
U.S. Franchised Electric and Gas(d)	$	10,586		$	33		$	10,619		$	2,604		$	1,383	$	3,717	$	47,977
Commercial Power(e)		2,480			11			2,491			225			230		492		6,939
International Energy		1,467			—			1,467			679			90		114		4,539
Total reportable segments		14,533			44			14,577			3,508			1,703		4,323		59,455
Other		(4	)		48			44			(261	)		103		141		2,961
Eliminations and reclassifications		—			(92	)		(92	)		—			—		—		110
Interest expense		—			—			—			(859	)		—		—		—
Interest income and other(h)		—			—			—			56			—		—		—
Add back of noncontrolling interest component of reportable segment and Other EBIT		—			—			—			21			—		—		—
Total consolidated	$	14,529		$	—		$	14,529		$	2,465		$	1,806	$	4,464	$	62,526
Year Ended December 31, 2010
U.S. Franchised Electric and Gas(c)(d)	$	10,563		$	34		$	10,597		$	2,966		$	1,386	$	3,891	$	45,210
Commercial Power(e)		2,440			8			2,448			(229	)		225		525		6,704
International Energy		1,204			—			1,204			486			86		181		4,310
Total reportable segments		14,207			42			14,249			3,223			1,697		4,597		56,224
Other(f)(g)		65			53			118			(255	)		89		258		2,845
Eliminations and reclassifications		—			(95	)		(95	)		—			—		—		21
Interest expense		—			—			—			(840	)		—		—		—
Interest income and other(h)		—			—			—			72			—		—		—
Add back of noncontrolling interest component of reportable segment and Other EBIT		—			—			—			10			—		—		—
Total consolidated	$	14,272		$	—		$	14,272		$	2,210		$	1,786	$	4,855	$	59,090
Year Ended December 31, 2009
U.S. Franchised Electric and Gas(c)	$	9,392		$	41		$	9,433		$	2,321		$	1,290	$	3,560	$	42,763
Commercial Power(e)		2,109			5			2,114			27			206		688		7,345
International Energy		1,158			—			1,158			365			81		128		4,067
Total reportable segments		12,659			46			12,705			2,713			1,577		4,376		54,175
Other		72			56			128			(251	)		79		181		2,736
Eliminations and reclassifications		—			(102	)		(102	)		—			—		—		129
Interest expense		—			—			—			(751	)		—		—		—
Interest income and other(h)		—			—			—			102			—		—		—
Add back of noncontrolling interest component of reportable segment and Other EBIT		—			—			—			18			—		—		—
Total consolidated	$	12,731		$	—		$	12,731		$	1,831		$	1,656	$	4,557	$	57,040

(a) Segment results exclude results of entities classified as discontinued operations.

(b) Includes assets held for sale and assets of entities in discontinued operations. See Note 13 for description and carrying value of investments accounted for under the equity method of accounting within each segment.

(c) On December 7, 2009 and January 10, 2010, the North Carolina and South Carolina rate case settlement agreements were approved by the NCUC and PSCSC, respectively. Among other things, the rate case settlements included an annual base rate increase of $315 million in North Carolina to be phased-in primarily over a two-year period beginning January 1, 2010, and a $74 million annual base rate increase in South Carolina effective February 1, 2010. On July 8, 2009, the PUCO approved a $55 million annual increase in rates for electric delivery service. These new rates were effective July 13, 2009. Additionally, on December 29, 2009, the KPSC approved a $13 million increase in annual base natural gas rates. New rates went into effect January 4, 2010.

(d) As discussed in Note 4, Duke Energy recorded pre-tax charges of $222 million and $44 million during the years ended December 31, 2011 and 2010, respectively related to the Edwardsport integrated gasification combined cycle (IGCC) plant that is currently under construction.

(e) As discussed further in Note 12, during the year ended December 31, 2011, Commercial Power recorded a $79 million impairment to write-down the carrying value of certain emission allowances. During the year ended December 31, 2010, Commercial Power recorded impairment charges of $660 million, which consisted of a $500 million goodwill impairment charge associated with the non-regulated Midwest generating operations and a $160 million pre-tax charge to write-down the value of certain non-regulated Midwest generating assets and emission allowances primarily associated with these generation assets. During the year ended December 31, 2009, Commercial Power recorded impairment charges of $413 million, which consists of a $371 million goodwill impairment charge associated with the non-regulated Midwest generation operations and a $42 million pre-tax charge to write-down the value of certain generating assets in the Midwest to their estimated fair value.

(f) During 2010, a $172 million expense was recorded related to the 2010 voluntary severance plan and the consolidation of certain corporate office functions from the Midwest to Charlotte, North Carolina (see Note 19).

(g) During 2010, Duke Energy recognized a $139 million pre-tax gain from the sale of a 50% ownership interest in DukeNet (see Note 2), and a $109 million pre-tax gain from the sale of an equity method investment in, Q-Comm Corporation (Q-Comm) (see Note 13).

(h) Other within Interest Income and Other includes foreign currency transaction gains and losses and additional noncontrolling interest amounts not allocated to the reportable segments and Other results.

Schedule Of Revenue And Long-Lived Assets, By Geographical Area

	U.S.		Latin America(a)		Consolidated
	(in millions)
2011
Consolidated revenues	$	13,062	$	1,467	$	14,529
Consolidated long-lived assets		45,920		2,612		48,532
2010
Consolidated revenues	$	13,068	$	1,204	$	14,272
Consolidated long-lived assets		42,754		2,733		45,487
2009
Consolidated revenues	$	11,573	$	1,158	$	12,731
Consolidated long-lived assets		41,043		2,561		43,604

(a) Change in amounts of long-lived assets in Latin America is primarily due to foreign currency translation adjustments on property, plant and equipment and other long-lived asset balances.