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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Credit Risk-Related Contingent Features [Abstract]      
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent provisions $ 156    
Aggregate fair value of collateral posted on these derivative instruments 38    
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 183 [1]    
Fair Value Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative 2 48 12
Gain (loss) recognized in income on related item 25 (6) 29
Fair Value Hedges [Member] | Interest Rate Swaps [Member] | Other Income (Expense) Net [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative 0 0 0
Gain (loss) recognized in income on related item 22 0 7
Cash Flow Hedges [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in OCI (effective portion) on derivative 341 367 848
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 616 210 (223)
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) (51) (215) (301)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in OCI (effective portion) on derivative (55) (145) 64
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) (13) (4) (2)
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) (13) (17) 0
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Income (Expense) Net [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 0 (30) 1
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 0 0 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in OCI (effective portion) on derivative (35) 25 (45)
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Interest Expense [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 5 2 2
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 0 0 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Income (Expense) Net [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 29 16 (20)
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 0 0 0
Cash Flow Hedges [Member] | Commodity Contracts [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in OCI (effective portion) on derivative 431 487 829
Cash Flow Hedges [Member] | Commodity Contracts [Member] | Wholesale Energy Marketing [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 835 680 358
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) (39) (201) (296)
Cash Flow Hedges [Member] | Commodity Contracts [Member] | Fuel [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 1 2 (20)
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 0 0 2
Cash Flow Hedges [Member] | Commodity Contracts [Member] | Energy Purchases [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) (243) (458) (544)
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 1 3 (7)
Cash Flow Hedges [Member] | Commodity Contracts [Member] | Depreciation [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 2 2 1
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 0 0 0
Cash Flow Hedges [Member] | Commodity Contracts [Member] | Other Operation And Maintenance [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) reclassified from AOCI into income on derivative (effective portion) 0 0 1
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) 0 0 0
Derivatives Not Designated As Hedging Instruments [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative 201 (450) (204)
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gains (losses) recognized as regulatory asset on derivative (26) (11) 0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative (8) 0 0
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Wholesale Energy Marketing [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative 1,606 (70) 588
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Fuel [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative (1) 12 12
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Energy Purchases [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative (1,493) (405) (808)
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Unregulated Retail Electric and Gas [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative 39 11 13
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Net Energy Trading Margins [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative (6) [2] 1 [2] 0
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Utility [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative (1) (2) 0
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Other Income (Expense) Net [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in income on derivative 65 3 (9)
Net Investment Hedges [Member] | Foreign Exchange Contracts [Member]
     
Amounts Included in the Income Statement or OCI [Abstract]      
Gain (loss) recognized in OCI (effective portion) on derivative $ 6 $ 5 $ (9)
[1] Includes the effect of net receivables and payables already recorded on the Balance Sheet.
[2] Differs from the Statement of Income due to intra-month transactions that PPL defines as spot activity, which is not accounted for as a derivative.