Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Numerator)
Net income	$ 364	$ 475	$ 441	$ 466	$ 415	$ 445	$ 515	$ 452	$ 1,746	$ 1,827	$ 1,128
Less amounts allocated to participating securities									1	2	2
Net income available to PPL common shareowners - Basic									1,745	1,825	1,126
Net income available to PPL common shareowners - Diluted									$ 1,745	$ 1,825	$ 1,126
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)									728,512	704,439	685,240
Add incremental non-participating securities:
Share-based payment awards (in shares)									1,101	445	2,094
Forward sales agreements									7,141	3,735	0
Weighted-average shares - Diluted EPS (in shares)									736,754	708,619	687,334
Basic EPS - Available to PPL common shareowners:
Net Income (in dollars per share)	$ 0.49	$ 0.66	$ 0.61	$ 0.65	$ 0.57	$ 0.63	$ 0.74	$ 0.65	$ 2.39	$ 2.59	$ 1.64
Diluted EPS - Available to PPL common shareowners:
Net Income (in dollars per share)	$ 0.48	$ 0.65	$ 0.60	$ 0.64	$ 0.57	$ 0.62	$ 0.73	$ 0.65	$ 2.37	$ 2.58	$ 1.64
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock issued under DRIP (in shares)									1,725
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)									1,936
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS									0	172	696
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS									5	0	0
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS									3	11	0