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Stock-Based Compensation (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Integer $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares
All Plans [Member] | Restricted Shares And Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 1,137,685 |  |
Granted (in shares) | 331,160 |  |
Vested (in shares) | (562,848) |  |
Forfeited (in shares) | (9,661) |  |
Nonvested, end of period (in shares) | 896,336 | 1,137,685 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 32.76 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 35.30 | $ 31.95 | $ 30.58
Weighted-average grant date fair value per share, vested (in dollars per share) | $ / shares | 34.57 |  |
Weighted-average grant date fair value per share, forfeited (in dollars per share) | $ / shares | 32.97 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 32.56 | $ 32.76 |
Total fair value of units vested during the period | $ | $ 19,000,000 | $ 13,000,000 | $ 16,000,000
Fair value assumptions and methodology [Abstract] |  |  |
Award vesting period (in years) | 3 years |  |
All Plans [Member] | Total Shareowner Return Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 739,392 |  |
Granted (in shares) | 261,891 |  |
Vested (in shares) | 0 |  |
Forfeited (in shares) | (375,029) |  |
Nonvested, end of period (in shares) | 626,254 | 739,392 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 37.50 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 37.63 | $ 35.83 | $ 38.26
Weighted-average grant date fair value per share, forfeited (in dollars per share) | $ / shares | 38.46 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 36.98 | $ 37.50 |
Total fair value of units vested during the period | $ |  | $ 3,000,000 |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Maximum payout percentage of target award | 200.00% |  |
Fair value assumptions and methodology [Abstract] |  |  |
Expected option life (in years) | 3 years | 3 years | 3 years
Expected stock volatility | 15.64% | 17.57% | 17.60%
All Plans [Member] | Total Shareowner Return Performance Units [Member] | Retirement Eligible [Member] |  |  |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Period over which performance units fair value is recognized (in years) | 1 year |  |
All Plans [Member] | Total Shareowner Return Performance Units [Member] | Not Retirement Eligible [Member] |  |  |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Minimum period after which employee stock options become exercisable (in years) | 1 year |  |
All Plans [Member] | Return On Equity Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 570,765 |  |
Granted (in shares) | 374,878 |  |
Vested (in shares) | (216,979) |  |
Nonvested, end of period (in shares) | 728,664 | 570,765 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 32.02 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 34.95 | $ 30.89 | $ 32.21
Weighted-average grant date fair value per share, vested (in dollars per share) | $ / shares | 34.42 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 32.81 | $ 32.02 |
Total fair value of units vested during the period | $ | $ 8,000,000 |  |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Maximum payout percentage of target award | 200.00% |  |
All Plans [Member] | Stock Options [Member] |  |  |
Stock option activity [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 1,330,943 |  |
Exercised (in shares) | (227,927) |  |
Weighted average remaining contractual term (in years) | 1 year 8 months 12 days |  |
Outstanding at end of period (in shares) | 1,103,016 | 1,330,943 |
Stock options - additional disclosures [Abstract] |  |  |
Period after which, employee stock options expire (in years) | 10 years |  |
Weighted-average exercise price per share at beginning of period (in dollars per share) | $ / shares | $ 26.20 |  |
Weighted average exercise price per share, exercised (in dollars per share) | $ / shares | 26.10 |  |
Weighted average exercise price per share at end of period (in dollars per share) | $ / shares | $ 26.22 | $ 26.20 |
Aggregate total intrinsic value | $ | $ 2,000,000 |  |
Cash received from exercise of stock options | $ | 8,000,000 | $ 53,000,000 | $ 5,000,000
Total intrinsic value of stock options exercised | $ |  | 11,000,000 |
All Plans [Member] | All Awards [Member] |  |  |
Aggregate disclosures [Abstract] |  |  |
Compensation expense | $ | 28,000,000 | 35,000,000 | 25,000,000
Income tax benefit | $ | 8,000,000 | $ 10,000,000 | $ 10,000,000
Unrecognized compensation expense | $ | $ 16,000,000 |  |
Weighted-average period for recognition | Integer | 1.7 |  |
Stock Incentive Plan [Member] |  |  |
Stock-Based Compensation [Line Items] |  |  |
Maximum number of shares approved for awards under the plan (in shares) | 15,000,000 |  |
Annual grant limit options (in shares) | 2,000,000 |  |
Annual grant limit for individual participants - performance based awards (in shares) | 750,000 |  |
Annual grant limit for individual participants - performance based awards | $ | $ 15,000,000 |  |
Incentive Compensation Plan For Key Employees [Member] |  |  |
Stock-Based Compensation [Line Items] |  |  |
Maximum number of shares approved for awards under the plan (in shares) | 14,199,796 |  |
Annual grant limit total as % of PPL outstanding PPL common stock on first day of each calendar year | 2.00% |  |
Annual grant limit options (in shares) | 3,000,000 |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | Restricted Shares And Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 229,860 |  |
Transfer between registrants | (1,197) |  |
Granted (in shares) | 65,356 |  |
Vested (in shares) | (79,313) |  |
Forfeited (in shares) | (3,986) |  |
Nonvested, end of period (in shares) | 210,720 | 229,860 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 32.61 |  |
Weighted-average grant date fair value per share, transfer between registrants (in dollars per share) | $ / shares | 32.23 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 35.37 | $ 32.33 | $ 30.00
Weighted-average grant date fair value per share, vested (in dollars per share) | $ / shares | 34.55 |  |
Weighted-average grant date fair value per share, forfeited (in dollars per share) | $ / shares | 32.65 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 32.73 | $ 32.61 |
Total fair value of units vested during the period | $ | $ 3,000,000 | $ 2,000,000 | $ 2,000,000
Fair value assumptions and methodology [Abstract] |  |  |
Award vesting period (in years) | 3 years |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | Total Shareowner Return Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 66,799 |  |
Granted (in shares) | 21,416 |  |
Vested (in shares) | 0 |  |
Forfeited (in shares) | (26,408) |  |
Nonvested, end of period (in shares) | 61,807 | 66,799 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 37.43 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 38.64 | $ 35.68 | $ 38.37
Weighted-average grant date fair value per share, forfeited (in dollars per share) | $ / shares | 38.37 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 37.44 | $ 37.43 |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Maximum payout percentage of target award | 200.00% |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | Total Shareowner Return Performance Units [Member] | Retirement Eligible [Member] |  |  |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Period over which performance units fair value is recognized (in years) | 1 year |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | Total Shareowner Return Performance Units [Member] | Not Retirement Eligible [Member] |  |  |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Minimum period after which employee stock options become exercisable (in years) | 1 year |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | Return On Equity Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 49,194 |  |
Granted (in shares) | 30,426 |  |
Vested (in shares) | (17,813) |  |
Nonvested, end of period (in shares) | 61,807 | 49,194 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 31.92 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 35.59 | $ 30.76 | $ 32.32
Weighted-average grant date fair value per share, vested (in dollars per share) | $ / shares | 34.41 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 33.01 | $ 31.92 |
Total fair value of units vested during the period | $ | $ 1,000,000 |  |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Maximum payout percentage of target award | 200.00% |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | Performance Units [Member] |  |  |
Fair value assumptions and methodology [Abstract] |  |  |
Expected option life (in years) | 3 years | 3 years | 3 years
Expected stock volatility | 15.64% | 17.57% | 17.60%
PPL Electric Utilities Corp [Member] | All Plans [Member] | Stock Options [Member] |  |  |
Stock options - additional disclosures [Abstract] |  |  |
Period after which, employee stock options expire (in years) | 10 years |  |
PPL Electric Utilities Corp [Member] | All Plans [Member] | All Awards [Member] |  |  |
Aggregate disclosures [Abstract] |  |  |
Compensation expense | $ | $ 10,000,000 | $ 12,000,000 | $ 10,000,000
Income tax benefit | $ | 3,000,000 | $ 3,000,000 | $ 3,000,000
Unrecognized compensation expense | $ | $ 3,000,000 |  |
Weighted-average period for recognition | Integer | 1.8 |  |
PPL Electric Utilities Corp [Member] | Stock Incentive Plan [Member] |  |  |
Stock-Based Compensation [Line Items] |  |  |
Maximum number of shares approved for awards under the plan (in shares) | 15,000,000 |  |
Annual grant limit options (in shares) | 2,000,000 |  |
Annual grant limit for individual participants - performance based awards (in shares) | 750,000 |  |
Annual grant limit for individual participants - performance based awards | $ | $ 15,000,000 |  |
PPL Electric Utilities Corp [Member] | Incentive Compensation Plan For Key Employees [Member] |  |  |
Stock-Based Compensation [Line Items] |  |  |
Maximum number of shares approved for awards under the plan (in shares) | 14,199,796 |  |
Annual grant limit total as % of PPL outstanding PPL common stock on first day of each calendar year | 2.00% |  |
Annual grant limit options (in shares) | 3,000,000 |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | Restricted Shares And Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 166,445 |  |
Transfer between registrants | (1,598) |  |
Granted (in shares) | 50,402 |  |
Vested (in shares) | (60,571) |  |
Forfeited (in shares) | (1,550) |  |
Nonvested, end of period (in shares) | 153,128 | 166,445 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 32.09 |  |
Weighted-average grant date fair value per share, transfer between registrants (in dollars per share) | $ / shares | 30.57 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 35.31 | $ 30.65 | $ 30.98
Weighted-average grant date fair value per share, vested (in dollars per share) | $ / shares | 34.88 |  |
Weighted-average grant date fair value per share, forfeited (in dollars per share) | $ / shares | 30.36 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 32.08 | $ 32.09 |
Total fair value of units vested during the period | $ | $ 2,000,000 | $ 1,000,000 | $ 5,000,000
Fair value assumptions and methodology [Abstract] |  |  |
Award vesting period (in years) | 3 years |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | Total Shareowner Return Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 130,533 |  |
Granted (in shares) | 35,538 |  |
Vested (in shares) | 0 |  |
Forfeited (in shares) | (66,459) |  |
Nonvested, end of period (in shares) | 99,612 | 130,533 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 37.60 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 37.73 | $ 35.93 | $ 38.32
Weighted-average grant date fair value per share, forfeited (in dollars per share) | $ / shares | 38.23 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 37.23 | $ 37.60 |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Maximum payout percentage of target award | 200.00% |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | Total Shareowner Return Performance Units [Member] | Retirement Eligible [Member] |  |  |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Period over which performance units fair value is recognized (in years) | 1 year |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | Total Shareowner Return Performance Units [Member] | Not Retirement Eligible [Member] |  |  |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Minimum period after which employee stock options become exercisable (in years) | 1 year |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | Return On Equity Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Nonvested, beginning of period (in shares) | 107,805 |  |
Granted (in shares) | 60,286 |  |
Vested (in shares) | (46,384) |  |
Nonvested, end of period (in shares) | 121,707 | 107,805 |
Awards, Equity Instruments Other than Options, additional disclosures (Details) [Abstract] |  |  |
Weighted-average grant date fair value per share, nonvested, beginning of period (in dollars per share) | $ / shares | $ 32.20 |  |
Weighted-average grant date fair value per share, granted (in dollars per share) | $ / shares | 34.81 | $ 30.99 | $ 32.28
Weighted-average grant date fair value per share, vested (in dollars per share) | $ / shares | 34.29 |  |
Weighted-average grant date fair value per share, nonvested - end of period (in dollars per share) | $ / shares | $ 32.70 | $ 32.20 |
Total fair value of units vested during the period | $ | $ 2,000,000 |  |
Period over which performance units fair value is recognized (in years) | 3 years |  |
Maximum payout percentage of target award | 200.00% |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | Performance Units [Member] |  |  |
Fair value assumptions and methodology [Abstract] |  |  |
Expected option life (in years) | 3 years | 3 years | 3 years
Expected stock volatility | 15.64% | 17.57% | 17.60%
LG And E And KU Energy LLC [Member] | All Plans [Member] | Stock Options [Member] |  |  |
Stock options - additional disclosures [Abstract] |  |  |
Period after which, employee stock options expire (in years) | 10 years |  |
LG And E And KU Energy LLC [Member] | All Plans [Member] | All Awards [Member] |  |  |
Aggregate disclosures [Abstract] |  |  |
Compensation expense | $ | $ 11,000,000 | $ 9,000,000 | $ 8,000,000
Income tax benefit | $ | 3,000,000 | $ 2,000,000 | $ 2,000,000
Unrecognized compensation expense | $ | $ 1,000,000 |  |
Weighted-average period for recognition | Integer | 1.4 |  |
LG And E And KU Energy LLC [Member] | Stock Incentive Plan [Member] |  |  |
Stock-Based Compensation [Line Items] |  |  |
Maximum number of shares approved for awards under the plan (in shares) | 15,000,000 |  |
Annual grant limit options (in shares) | 2,000,000 |  |
Annual grant limit for individual participants - performance based awards (in shares) | 750,000 |  |
Annual grant limit for individual participants - performance based awards | $ | $ 15,000,000 |  |
LG And E And KU Energy LLC [Member] | Incentive Compensation Plan For Key Employees [Member] |  |  |
Stock-Based Compensation [Line Items] |  |  |
Maximum number of shares approved for awards under the plan (in shares) | 14,199,796 |  |
Annual grant limit total as % of PPL outstanding PPL common stock on first day of each calendar year | 2.00% |  |
Annual grant limit options (in shares) | 3,000,000 |  |

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- Definition The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References No definition available. + Details
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- Definition The value of performance based awards that can be awarded under the plan to any single eligible employee in any calendar year. + References No definition available. + Details
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- Definition The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. + References No definition available. + Details
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