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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ 1,926 | $ 1,845 | $ 1,725 | $ 1,951 | $ 1,832 | $ 1,889 | $ 1,785 | $ 2,011 | $ 7,447 |  | $ 7,517 |  | $ 7,669 |
Operating income |  | 793 | 777 | 702 | 796 | 714 | 786 | 725 | 823 | 3,068 |  | 3,048 |  | 2,831 |
Income from continuing operations after income taxes |  |  |  |  |  |  |  |  |  | 1,128 |  | 1,902 |  | 1,603 |
Loss from Discontinued Operations (net of income taxes) |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (921) |
Net income (loss) |  | $ 78 | $ 355 | $ 292 | $ 403 | $ 465 | $ 473 | $ 483 | $ 481 | $ 1,128 |  | $ 1,902 |  | $ 682 |
Income from continuing operations after income taxes available to PPL common shareowners: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.64 |  | $ 2.80 |  | $ 2.38 |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | 1.64 |  | 2.79 |  | 2.37 |
Net income (loss) available to PPL common shareowners: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  | $ 0.11 | $ 0.52 | $ 0.43 | $ 0.59 | $ 0.68 | $ 0.70 | $ 0.71 | $ 0.71 | 1.64 |  | 2.80 |  | 1.01 |
Diluted (in dollars per share) |  | 0.11 | 0.51 | 0.43 | 0.59 | 0.68 | 0.69 | 0.71 | 0.71 | 1.64 |  | 2.79 |  | 1.01 |
Dividends declared per share of common stock (in dollars per share) | $ 0.395 | 0.3950 | 0.3950 | 0.3950 | 0.3950 | 0.38 | 0.38 | 0.38 | 0.38 | $ 1.58 |  | $ 1.52 |  | $ 1.50 |
Price per common share: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) |  | 38.37 | 39.83 | 40.06 | 37.70 | 34.74 | 37.71 | 39.68 | 38.07 |  |  |  |  |  |
Low (in dollars per share) |  | $ 30.76 | $ 37.36 | $ 37.11 | $ 33.94 | $ 32.19 | $ 33.63 | $ 36.27 | $ 32.80 |  |  |  |  |  |
PPL Energy Supply Spinoff [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from Discontinued Operations (net of income taxes) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (921) |
Price per common share: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal group |  |  |  |  |  |  |  |  |  |  |  |  |  | (879) |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  | $ 575 | $ 547 | $ 500 | $ 573 | $ 537 | $ 539 | $ 495 | $ 585 | $ 2,195 |  | $ 2,156 |  | 2,124 |
Operating income |  | 197 | 189 | 156 | 159 | 154 | 176 | 154 | 180 | 701 |  | 664 |  | 538 |
Net income (loss) |  | $ 111 | $ 95 | $ 77 | $ 79 | $ 77 | $ 90 | $ 79 | $ 94 | $ 362 | [1] | $ 340 | [1] | $ 252 | [1]
[1] | Net income equals comprehensive income.

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