Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share

			Average
(in millions, except per-share amounts)	Income		Shares			EPS
Three Months Ended June 30, 2012
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic	$	444		446	$	0.99
Effect of dilutive securities:
Stock options, performance and restricted stock				―
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — diluted	$	444		446	$	0.99
Three Months Ended June 30, 2011
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic	$	434		444	$	0.98
Effect of dilutive securities:
Stock options, performance and restricted stock				―
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — diluted	$	434		444	$	0.98

			Average
(In millions, except per-share amounts)	Income		Shares		EPS
Six Months Ended June 30, 2012
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic	$	736		446	$	1.65
Effect of dilutive securities:
Stock options, performance and restricted stock				―
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — diluted	$	736		446	$	1.65
Six Months Ended June 30, 2011
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — basic	$	944		444	$	2.13
Effect of dilutive securities:
Stock options, performance and restricted stock				―
Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities — diluted	$	944		444	$	2.13