Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income (Numerator) [Abstract]
Net Income	$ 445	$ 355	$ 1,412	$ 1,050
Less amounts allocated to participating securities	1	1	2	2
Net income available to PPL common shareowners - Basic	444	354	1,410	1,048
Net income available to PPL common shareowners - Diluted	$ 444	$ 354	$ 1,410	$ 1,048
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	703,730	686,563	699,117	683,783
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	298	2,183	427	2,298
Forward sale agreements	6,489	0	2,761	0
Weighted-average shares - Diluted EPS (in shares)	710,517	688,746	702,305	686,081
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.63	$ 0.52	$ 2.02	$ 1.53
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.62	$ 0.51	$ 2.01	$ 1.53
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	80	256	568	1,707
Common stock issued under dividend reinvestment plan (in shares)	493	355	1,504	1,169
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	15	696	229	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	2	0	15	0