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Rate Matters (Tables)
6 Months Ended
Jun. 30, 2011
Effects of Regulation (Tables) [Abstract]  
Schedule Of Regulatory Assets Text Block
Regulatory Assets Not Yet Being Recovered      
    June 30, December 31,
    2011 2010
    (in millions)
 Noncurrent Regulatory Assets (excluding fuel)      
 Regulatory assets not yet being recovered pending future proceedings      
   to determine the recovery method and timing:      
 Regulatory Assets Currently Earning a Return      
  Line Extension Carrying Costs - CSPCo, OPCo (a) $ 61 $ 55
  Customer Choice Deferrals - CSPCo, OPCo (a)   60   59
  Storm Related Costs - CSPCo, OPCo (a)   31   30
  Storm Related Costs - TCC   25   25
  Storm Related Costs - PSO (c)    18   -
  Acquisition of Monongahela Power - CSPCo (a)   9   8
  Other Regulatory Assets Not Yet Being Recovered   7   7
 Regulatory Assets Currently Not Earning a Return      
  Environmental Rate Adjustment Clause - APCo   65   56
  Storm Related Costs - APCo, KGPCo, SWEPCo   28   28
  Deferred Wind Power Costs - APCo   38   29
  Mountaineer Carbon Capture and Storage Product Validation Facility - APCo (b)   19   60
  Special Rate Mechanism for Century Aluminum - APCo   13   13
  Acquisition of Monongahela Power - CSPCo (a)   4   4
  Storm Related Costs - PSO (c)    -   17
  Other Regulatory Assets Not Yet Being Recovered   5   4
 Total Regulatory Assets Not Yet Being Recovered $ 383 $ 395

       (a)       Requested to be recovered in a distribution asset recovery rider. See the "2011 Ohio Distribution Base Rate Case" section below.

       (b)       APCo wrote off a portion of the Mountaineer Carbon Capture and Storage Product Validation Facility as denied for recovery by the WVPSC in March 2011. See "Mountaineer Carbon Capture and Storage Project Product Validation Facility" section below.

       (c)       In June 2011, an order was received approving recovery of PSO storm costs and associated carrying costs with recovery to begin in August 2011. Starting in the second quarter of 2011, and in accordance with the order received from the OCC, PSO recorded a return on its storm related costs.