Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income (Numerator) [Abstract]
Net Income	$ 515	$ 292	$ 967	$ 695
Less amounts allocated to participating securities	0	0	1	1
Net income available to PPL common shareowners - Basic	515	292	966	694
Net income available to PPL common shareowners - Diluted	$ 515	$ 292	$ 966	$ 694
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	699,006	683,841	696,772	682,370
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	173	2,510	491	2,355
Forward sale agreements	1,797	0	898	0
Weighted-average shares - Diluted EPS (in shares)	700,976	686,351	698,161	684,725
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.74	$ 0.43	$ 1.39	$ 1.02
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.73	$ 0.43	$ 1.38	$ 1.01
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	12	564	488	1,451
Common stock issued under dividend reinvestment plan (in shares)	526	369	1,011	814
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	441	696	336	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	23	0	21	0