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Stock-Based Compensation
3 Months Ended
Mar. 31, 2013
Stock-Based Compensation [Abstract]  
Stock-Based Compensation

13. STOCK-BASED COMPENSATION

For employee awards, equity classified stock-based compensation cost is measured at the service inception date or the grant date, based on the estimated achievement of certain performance metrics or the fair value of the award, and is recognized as expense or capitalized as a component of property, plant and equipment over the requisite service period.

Duke Energy recorded pre-tax stock-based compensation expense as shown in the following table.

       
  Three Months Ended March 31,
(in millions)2013 2012
Stock Options$ 2 $ 2
Restricted Stock Unit Awards  13   8
Performance Awards  11   (2)
Total$ 26 $ 8
Tax benefit associated with stock-based compensation expense$ 10 $ 3
Stock-based compensation costs capitalized  1