Earnings Per Common Share (EPS) (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2011

Earnings Per Common Share (EPS)

Schedule of Earnings Per Share, Basic, by Common Class

	Income			Average Shares		EPS
	(in millions, except per- share amounts)
Three Months Ended June 30, 2011
Income from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—basic	$	434			1,332	$	0.33
Effect of dilutive securities:
Stock options, performance and restricted stock					1
Income from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—diluted	$	434			1,333	$	0.33
Three Months Ended June 30, 2010
Loss from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—basic and diluted	$	(223	)		1,314	$	(0.17	)

	Income		Average Shares		EPS
	(in millions, except per- share amounts)
Six Months Ended June 30, 2011
Income from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—basic	$	944		1,331	$	0.71
Effect of dilutive securities:
Stock options, performance and restricted stock				1
Income from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—diluted	$	944		1,332	$	0.71
Six Months Ended June 30, 2010
Income from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—basic	$	221		1,312	$	0.17
Effect of dilutive securities:
Stock options, performance and restricted stock				1
Income from continuing operations attributable to Duke Energy common stockholders, as adjusted for participating securities—diluted	$	221		1,313	$	0.17