Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Information

	First Quarter		Second Quarter			Third Quarter		Fourth Quarter		Total
	(In millions, except per share data)
2011
Operating revenues	$	3,663	$	3,534		$	3,964	$	3,368	$	14,529
Operating income		814		679			767		517		2,777
Net income attributable to Duke Energy Corporation		511		435			472		288		1,706
Earnings per share:
Basic(a)	$	0.38	$	0.33		$	0.35	$	0.22	$	1.28
Diluted(a)	$	0.38	$	0.33		$	0.35	$	0.22	$	1.28
2010
Operating revenues	$	3,594	$	3,287		$	3,946	$	3,445	$	14,272
Operating income (loss)		761		(14	)		1,033		681		2,461
Net income (loss) attributable to Duke Energy Corporation		445		(222	)		670		427		1,320
Earnings (loss) per share:
Basic(a)	$	0.34	$	(0.17	)	$	0.51	$	0.32	$	1.00
Diluted(a)	$	0.34	$	(0.17	)	$	0.51	$	0.32	$	1.00

(a) Quarterly EPS amounts are meant to be stand-alone calculations and are not always additive to full-year amount due to rounding.

Schedule Of Unusual Or Infrequently Occurring Items

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	(In Millions)
2011
Edwardsport IGCC impairment (see Note 4)	$	—		$	—		$	(222	)	$	—
Emission Allowance impairment (see Note 12)		—			—			(79	)		—
Energy efficiency revenue adjustment(a)		—			—			—			59
Total	$	—		$	—		$	(301	)	$	-59
2010
Voluntary severance program expenses (see Note 19)	$	(68	)	$	(76	)	$	(20	)	$	(8	)
Commercial Power non-regulated Midwest generation goodwill impairment (see Note 12)		—			(500	)		—			—
Midwest generation asset and emission allowance impairment (see Note 12)		—			(160	)		—			—
Edwardsport IGCC impairment (see Note 4)		—			—			(44	)		—
Gain on sale of investment in Q-Comm (see Note 13)		—			—			—			109
Gain on sale of DukeNet (see Note 3)		—			—			—			139
Total	$	(68	)	$	(736	)	$	(64	)	$	240

(a) In the fourth quarter of 2011, Duke Energy recorded $59 million of previously deferred revenue resulting from the receipt of an order from the NCUC which allowed the recognition of revenue in excess of amounts billed to customers.