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Derivative Instruments and Hedging Activities (Intro) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2010
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2009
Dec. 31, 2010
Master Netting Arrangements (Numeric) [Abstract]                
Obligation to return cash collateral obligation under master netting arrangement   $ 79     $ 79     $ 338
Cash collateral posted under master netting arrangements   23     23     19
Commodity Price Risk (Non Trading) Monetization Of Certain Full Requirement Sales Contracts (Numeric) [Abstract]                
Proceeds received in July 2010 from the monetization of certain full-requirement sales contracts 156              
Fair value of NPNS contracts recorded due to sale of these contracts in July 2010     66     66    
Realized pre-tax gains (losses) on NPNS contracts recorded due to sale of contracts in July 2010     66     66    
Portion of the fair value of NPNS contracts recorded that were not monetized     16     16    
Dedesignation of cash flow hedges due to the late July 2010 monetization of certain full-requirement sales contracts     (87)     (87)    
Change in fair value related to certain full-requirement sales contracts that were monetized in July 2010     (23)     (23)    
Unrealized pre-tax loss recorded on the monetization of certain full-requirement sales contracts in July 2010     (60)     (60)    
Unrealized after-tax loss recorded on the monetization of certain full-requirement sales contracts in July 2010     (36)     (36)    
Commodity Price Risk (Non-trading) Cash Flow Hedge Activity (Numeric) [Abstract]                
Year of expiration of the maximum maturity date of commodity price risk cash flow hedge contracts         2016      
Net unrealized after-tax gains (losses) expected to be reclassified into earnings within 12 months related to commodity price risk cash flow hedge contracts   287     287      
After-tax gains (losses) previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts     (56)     (53)    
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts   insignificant     insignificant      
Hedge ineffectiveness after-tax gains (losses) related to commodity price risk cash flow hedge contracts   (10) (30)   (14) (24)    
After-tax gains (losses) resulting from hedge effectiveness testing failure reversals related to commodity price risk cash flow hedge contracts       (82)        
Commodity Price Risk (Non Trading) Economic Activity (Numeric) [Abstract]                
Year of expiration of the maximum maturity date of economic activity derivative contracts         2017      
Fair value of commodity contracts classified as economic activity, net (asset) liability   235     235     389
Pre-tax Gains (Losses) Of Economic Activity Details - Unregulated Business [Abstract]                
Pre-tax impact of correction of an error that was deemed to have an immaterial impact on prior periods       5     35  
After-tax impact of correction of an error that was deemed to have an immaterial impact on prior periods       3     20  
Per share impact of correction of an error that was deemed to have an immaterial impact on prior periods (in dollars per share)       $ 0.01     $ 0.05  
Commodity Price Risk (Non-Trading) Economic Activity - Regulated Business (Numeric) [Abstract]                
Year of expiration of the maximum maturity date of economic activity derivative contracts specific to regulated business         2017      
Commodity Volumetric Activity (Numeric) [Abstract]                
Number Of Strategies Used To Maximize Wholesale Energy Portfolio Value         4      
Unregulated Retail Electric and Gas [Member]
               
Pre-tax Gains (Losses) Of Economic Activity Details - Unregulated Business [Abstract]                
Pre-tax gain (loss)   1 (2)   5 8    
Wholesale Energy Marketing [Member]
               
Pre-tax Gains (Losses) Of Economic Activity Details - Unregulated Business [Abstract]                
Pre-tax gain (loss)   (44) (666)   13 (242)    
Fuel [Member]
               
Pre-tax Gains (Losses) Of Economic Activity Details - Unregulated Business [Abstract]                
Pre-tax gain (loss)   (11) (8)   12 (3)    
Energy Purchases [Member]
               
Pre-tax Gains (Losses) Of Economic Activity Details - Unregulated Business [Abstract]                
Pre-tax gain (loss)   $ 109 $ 445 [1]   $ 127 $ (118) [1]    
[1] During the second quarter of 2010, PPL Energy Supply corrected an error relating to the fair value of a capacity contract (classified as economic activity) due to the use of an incorrect forward capacity curve. PPL Energy Supply's energy purchases were understated for the year ended December 31, 2009 and the first quarter of 2010 by an unrealized amount of $35 million ($20 million after tax or $0.05 per share, basic and diluted, for PPL) and $5 million ($3 million after tax or $0.01 per share, basic and diluted, for PPL). Management concluded that the impacts were not material to first quarter 2010 financial statements of PPL and PPL Energy Supply, and were not material to the financial statements for the full year 2010.