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Acquisitions, Development and Divestitures - Discontinued Operations (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 01, 2015
USD ($)
approach
Jun. 30, 2015
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Discontinued Operations - Spinoff of PPL Energy Supply - Continuing Involvement (Numeric) [Abstract]            
Energy purchases     $ 151 $ 177 $ 531 $ 676
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]            
Income (Loss) from Discontinued Operations (net of income taxes)     0 (3) $ 0 (915)
PPL Energy Supply Spinoff [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]            
Effective date of spinoff         Jun. 01, 2015  
Certain details of spinoff transaction        
In June 2015, PPL completed the spinoff of PPL Energy Supply, which combined its competitive power generation businesses with those of Riverstone to form a new, stand-alone, publicly traded company named Talen Energy.
  
Initial percent ownership in new company, Talen Energy, by PPL shareowners 65.00%          
Initial percent ownership in new company, Talen Energy, by Riverstone Holdings, LLC 35.00%          
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Number of approaches | approach 3          
Weighted fair value $ 3,200          
Control premium 25.00%          
Number of market approaches | approach 2          
Review period used in determining the control premium (in years) 5 years          
Minimum transaction value reviewed in determining the control premium $ 1,000          
Carrying value of the Supply segment 4,100          
Loss on spinoff 879     0   (879)
Discontinued Operations - Spinoff of PPL Energy Supply - Costs of Spinoff (Numeric) [Abstract]            
Employee related costs incurred at the spinoff closing date reflected in discontinued operations 24          
Third-party costs           44
Bank advisory, legal and accounting fees           31
Consulting and other costs           13
Loss on interest rate swaps recognized in discontinued operations on the statement of income 72          
Loss after-tax, on interest rate swaps recognized in discontinued operations on the statement of income 42          
Discontinued Operations - Spinoff of PPL Energy Supply - Continuing Involvement (Numeric) [Abstract]            
Maximum period for Transition Service Agreement (in years)         2 years  
Amount for services billed to spinoff     9 11 $ 29 14
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]            
Operating revenues       0   1,427
Operating expenses       0   1,328
Other Income (Expense) - net       0   (22)
Interest expense       0   150 [1]
Income (loss) before income taxes       0   (73)
Income tax expense (benefit)       3   (37)
Loss on spinoff 879     0   (879)
Income (Loss) from Discontinued Operations (net of income taxes)       (3)   (915)
PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Continuing Involvement (Numeric) [Abstract]            
Energy purchases     15   98  
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Weighting   50.00%        
Weighted fair value $ 1,400          
Control premium 25.00%          
Midpoint of premiums received in market sales transactions reviewed 25.00%          
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member] | Minimum [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Control premium 5.00%          
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member] | Maximum [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Control premium 42.00%          
PPL Energy Supply Spinoff [Member] | Income Discounted Cash Flow [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Weighting   30.00%        
Weighted fair value $ 1,100          
PPL Energy Supply Spinoff [Member] | Alternative Market Comparable Company [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Weighting   20.00%        
Weighted fair value $ 700          
Control premium 25.00%          
Midpoint of premiums received in market sales transactions reviewed 25.00%          
PPL Energy Supply Spinoff [Member] | Alternative Market Comparable Company [Member] | Minimum [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Control premium 5.00%          
PPL Energy Supply Spinoff [Member] | Alternative Market Comparable Company [Member] | Maximum [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Loss on Spinoff (Numeric) [Abstract]            
Control premium 42.00%          
PPL Electric Utilities Corp [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Continuing Involvement (Numeric) [Abstract]            
Energy purchases     129 $ 154 414 $ 519
PPL Electric Utilities Corp [Member] | PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]            
Discontinued Operations - Spinoff of PPL Energy Supply - Continuing Involvement (Numeric) [Abstract]            
Energy purchases     $ 15   $ 98  
[1] Includes interest associated with the Supply segment with no additional allocation as the Supply segment was sufficiently capitalized.