Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (Numerator)
Net income	$ 1,469	$ 1,746	$ 1,827
Less amounts allocated to participating securities	1	1	2
Net income available to PPL common shareowners - Basic	1,468	1,745	1,825
Net income available to PPL common shareowners - Diluted	$ 1,468	$ 1,745	$ 1,825
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)	768,590	728,512	704,439
Add incremental non-participating securities:
Share-based payment awards (in shares)	794	1,101	445
Forward sales agreements	0	7,141	3,735
Weighted-average shares - Diluted EPS (in shares)	769,384	736,754	708,619
Basic EPS - Available to PPL common shareowners:
Net Income (in dollars per share)	$ 1.91	$ 2.39	$ 2.59
Diluted EPS - Available to PPL common shareowners:
Net Income (in dollars per share)	$ 1.91	$ 2.37	$ 2.58
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock issued under DRIP (in shares)	943
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	731
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	452	8	183