Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Stock-Based Compensation Expense

	For the Years Ended December 31,
	2011(a)		2010(a)		2009(a)
	(in millions)
Stock Options	$	2	$	2	$	2
Phantom Awards		27		26		17
Performance Awards		23		39		20
Other Stock Awards		—		—		1
Total	$	52	$	67	$	40

(a) Excludes stock-based compensation cost capitalized as a component of property, plant and equipment of $2 million, $4 million and $4 million for the years ended December 31, 2011, 2010 and 2009, respectively.

Schedule Of 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, 2010		13,881		$	17
Granted		1,074			18
Exercised		(4,734	)		15
Forfeited or expired		(3,954	)		22
Outstanding at December 31, 2011		6,267		$	15		4.6	$	41
Exercisable at December 31, 2011		4,256		$	15		2.7	$	31
Options Expected to Vest		2,011		$	17		8.6	$	10

Weighted-Average Assumptions Used For Option Pricing

Risk-free interest rate(a)	2.5	%
Expected dividend yield(b)	5.7	%
Expected life(c)	6.0 years
Expected volatility(d)	18.8	%

(a) The risk free rate is based upon the U.S. Treasury Constant Maturity rates as of the grant date.

(b) The expected dividend yield is based upon annualized dividends 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.

Phantom Awards [Member]

Schedule Of Shares Awarded

	Shares awarded (in thousands)		Fair  value(a) (in millions)
Years ended December 31,
2011		1,907	$	34
2010		1,047		17
2009		1,096		16

(a) Based on the market price of Duke Energy's common stock at the grant date.

Summary Of Stock Awards Outstanding

	Shares (in thousands)			Weighted Average Per  Share Grant Date Fair Value
Number of Phantom Stock Awards:
Outstanding at December 31, 2010		1,763		$	17
Granted		1,907			18
Vested		(1,057	)		18
Forfeited		(46	)		18
Outstanding at December 31, 2011		2,567		$	17
Phantom Stock Awards Expected to Vest		2,503		$	17

Performance Awards [Member]

Schedule Of Shares Awarded

	Shares awarded (in thousands)		Fair  value(a) (in millions)
Years ended December 31,
2011		1,294	$	20
2010		2,734		38
2009		3,426		44

(a) Based on the market price of Duke Energy's common stock at the grant date.

Summary Of Stock Awards Outstanding

	Shares (in thousands)			Weighted Average Per  Share Grant Date Fair Value
Number of Stock-based Performance Awards:
Outstanding at December 31, 2010		7,550		$	14
Granted		1,294			16
Vested		(2,111	)		16
Forfeited		(363	)		13
Outstanding at December 31, 2011		6,370		$	14
Stock-based Performance Awards Expected to Vest		6,212		$	14

Other Stock Awards [Member]

Summary Of Stock Awards Outstanding

	Shares (in thousands)			Weighted Average Per Share Grant Date Fair Value
Number of Other Stock Awards:
Outstanding at December 31, 2010		131		$	28
Vested		(131	)		28
Forfeited		—			—
Outstanding at December 31, 2011		—		$	—