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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income (Numerator) [Abstract] |  |  |  |
Net Income | $ 515 | $ 292 | $ 967 | $ 695
Less amounts allocated to participating securities | 0 | 0 | 1 | 1
Net income available to PPL common shareowners - Basic | 515 | 292 | 966 | 694
Net income available to PPL common shareowners - Diluted | $ 515 | $ 292 | $ 966 | $ 694
Shares of Common Stock (Denominator) [Abstract] |  |  |  |
Weighted-average shares - Basic EPS (in shares) | 699,006 | 683,841 | 696,772 | 682,370
Add incremental non-participating securities: [Abstract] |  |  |  |
Share-based payment awards (in shares) | 173 | 2,510 | 491 | 2,355
Forward sale agreements | 1,797 | 0 | 898 | 0
Weighted-average shares - Diluted EPS (in shares) | 700,976 | 686,351 | 698,161 | 684,725
Basic EPS - Available to PPL common shareowners: [Abstract] |  |  |  |
Net Income Available to PPL common shareowners (in dollars per share) | $ 0.74 | $ 0.43 | $ 1.39 | $ 1.02
Diluted EPS - Available to PPL common shareowners: [Abstract] |  |  |  |
Net Income Available to PPL common shareowners (in dollars per share) | $ 0.73 | $ 0.43 | $ 1.38 | $ 1.01
Shares Issued (Numeric) [Abstract] |  |  |  |
Common stock issued under stock-based compensation plans (in shares) | 12 | 564 | 488 | 1,451
Common stock issued under dividend reinvestment plan (in shares) | 526 | 369 | 1,011 | 814
Stock Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Shares excluded from the computations of diluted EPS | 441 | 696 | 336 | 696
Restricted Stock Units (RSUs) [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Shares excluded from the computations of diluted EPS | 23 | 0 | 21 | 0

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