Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income (Numerator) [Abstract]
Net Income	$ 466	$ 452
Less amounts allocated to participating securities	0	1
Net income available to PPL common shareowners - Basic	466	451
Net income available to PPL common shareowners - Diluted	$ 466	$ 451
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	721,023	694,514
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	1,023	808
Forward sale agreements	7,907	0
Weighted-average shares - Diluted EPS (in shares)	729,953	695,322
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.65	$ 0.65
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.64	$ 0.65
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	590	476
Common stock issued under DRIP (in shares)	458	485
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	0	230
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	0	20