Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Total Stock-Based Compensation Expense, net of tax

	Years Ended December 31,
(in millions)	2012		2011		2010
Duke Energy	$	48	$	32	$	41
Duke Energy Carolinas		12		17		23
Progress Energy		25		20		16
Progress Energy Carolinas		16		12		10
Progress Energy Florida		9		8		7
Duke Energy Ohio		4		6		7
Duke Energy Indiana		4		4		6

Schedule Of Stock-Based Compensation Expense

	Years Ended December 31,
(in millions)	2012		2011		2010
Stock Options	$	2	$	2	$	2
Restricted Stock Unit Awards		43		27		26
Performance Awards		33		23		39
Total	$	78	$	52	$	67
Tax benefit associated with stock-based compensation expense	$	30	$	20	$	26
Stock-based compensation costs capitalized		2		2		4

Schedule of Share-based Compensation, Stock Options, Activity

Stock Option Activity
		Options (in thousands)		Weighted-Average Exercise Price		Weighted-Average Remaining Life (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2011			2,089	$	46
	Progress Energy transfers in(a)		94		50
	Granted		340		63
	Exercised		(580)		36
	Forfeited or expired		(289)		65
Outstanding at December 31, 2012			1,654		51		6.3	$	22
Exercisable at December 31, 2012			953		45		4.8		17
Options expected to vest			701		58		8.5		4
(a)	Progress Energy had an insignificant number of stock options outstanding as of and for the years ended December 31, 2011 and 2010.

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Exercises

	Years Ended December 31,
(in millions)	2012		2011		2010
Intrinsic value of options exercised	$	17	$	26	$	8
Tax benefit related to options exercised		7		10		3
Cash received from options exercised		21		74		14
Stock options granted (in thousands)		340		358		368

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

	The following assumptions were used to determine the grant date fair value of the stock options granted in 2012.
Weighted-Average Assumptions for Option Pricing
Risk-free interest rate(a)			1.1	%
Expected dividend yield(b)			5.1	%
Expected life(c)		6	years
Expected volatility(d)			18.8	%
(a)	The risk-free rate is based upon the average of 5-year and 7-year U.S. Treasury Constant Maturity rates as of the grant date.
(b)	The expected dividend yield is based upon the most recent annualized dividend and the 1-year average closing stock price.
(c)	The expected life of options is derived from the simplified method approach.
(d)	Volatility is based upon 50% historical and 50% implied volatility. Historic volatility is based on Duke Energy's historical volatility over the expected life using daily stock prices. Implied volatility is the average for all option contracts with a term greater than six months using the strike price closest to the stock price on the valuation date.

Schedule of Share-based Compensation, Restricted Stock Units Awarded Activity

		Years Ended December 31,
		2012		2011		2010
Shares awarded (in thousands)			443		636		349
Fair value (in millions)(a)		$	28	$	34	$	17
(a)	Based on the market price of Duke Energy's common stock at the grant date.

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

	The following table summarizes information about restricted stock unit awards outstanding.
		Shares (in thousands)		Weighted-Average Per Share Grant Date Fair Value
Outstanding at December 31, 2011			856	$	51
	Progress Energy transfers in		988		70
	Granted		443		63
	Vested		(608)		56
	Forfeited		(72)		64
Outstanding at December 31, 2012			1,607		64
Restricted stock unit awards expected to vest			1,567		64

Schedule of Share-based Compensation, Performance Awards Awarded Activity

		Years Ended December 31,
		2012		2011		2010
Shares awarded (in thousands)			352		432		912
Fair value (in millions)(a)		$	19	$	20	$	38
(a)	Based on the market price of Duke Energy's common stock at the grant date.

Schedule of Nonvested Performance-based Units Activity

	The following table summarizes information about stock-based performance awards outstanding at the maximum level.
		Shares (in thousands)		Weighted-Average Per Share Grant Date Fair Value
Number of stock-based performance awards:
Outstanding at December 31, 2011			2,123	$	42
	Progress Energy transfers in		1,548		50
	Granted		352		54
	Vested		(1,009)		56
	Forfeited		(668)		48
Outstanding at December 31, 2012			2,346		47
Stock-based performance awards expected to vest			2,132		48

Progress Energy [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Stock-Based Compensation Expense

	Years Ended December 31,
(in millions)	2012		2011		2010
Restricted stock unit awards	$	27	$	24	$	21
Performance awards		12		9		6
Total	$	39	$	33	$	27
Tax benefit associated with stock-based compensation expense	$	15	$	13	$	11