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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income (Numerator) [Abstract] |  |  |  |
Net Income | $ 292 | $ 483 | $ 695 | $ 964
Less amounts allocated to participating securities | 0 | 1 | 1 | 3
Net income available to PPL common shareowners - Basic | 292 | 482 | 694 | 961
Net income available to PPL common shareowners - Diluted | $ 292 | $ 482 | $ 694 | $ 961
Shares of Common Stock (Denominator) [Abstract] |  |  |  |
Weighted-average shares - Basic EPS (in shares) | 683,841 | 677,145 | 682,370 | 676,293
Add incremental non-participating securities: [Abstract] |  |  |  |
Share-based payment awards (in shares) | 2,510 | 3,584 | 2,355 | 3,480
Weighted-average shares - Diluted EPS (in shares) | 686,351 | 680,729 | 684,725 | 679,773
Basic EPS - Available to PPL common shareowners: [Abstract] |  |  |  |
Net Income Available to PPL common shareowners (in dollars per share) | $ 0.43 | $ 0.71 | $ 1.02 | $ 1.42
Diluted EPS - Available to PPL common shareowners: [Abstract] |  |  |  |
Net Income Available to PPL common shareowners (in dollars per share) | $ 0.43 | $ 0.71 | $ 1.01 | $ 1.41
Shares Issued (Numeric) [Abstract] |  |  |  |
Common stock issued under stock-based compensation plans (in shares) | 564 | 795 | 1,451 | 2,920
Common stock issued under dividend reinvestment plan (in shares) | 369 | 370 | 814 | 772
Stock Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Shares excluded from the computations of diluted EPS | 696 | 696 | 696 | 696
Performance units [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Shares excluded from the computations of diluted EPS | 0 | 78 | 0 | 39

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