Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income (Numerator) [Abstract]
Net Income	$ 452	$ 403
Less amounts allocated to participating securities	1	1
Net income available to PPL common shareowners - Basic	451	402
Net income available to PPL common shareowners - Diluted	$ 451	$ 402
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	694,514	680,882
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	808	2,202
Weighted-average shares - Diluted EPS (in shares)	695,322	683,084
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.65	$ 0.59
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.65	$ 0.59
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	476	887
Common stock issued under dividend reinvestment plan (in shares)	485	445
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	230	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	20	0