Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income (Numerator) [Abstract]
Net Income	$ 355	$ 473	$ 1,050	$ 1,437
Less amounts allocated to participating securities	1	1	2	4
Net income available to PPL common shareowners - Basic	354	472	1,048	1,433
Net income available to PPL common shareowners - Diluted	$ 354	$ 472	$ 1,048	$ 1,433
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	686,563	678,114	683,783	676,905
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	2,183	2,234	2,298	3,064
Weighted-average shares - Diluted EPS (in shares)	688,746	680,348	686,081	679,969
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.52	$ 0.70	$ 1.53	$ 2.12
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.51	$ 0.69	$ 1.53	$ 2.11
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	256	248	1,707	3,168
Common stock issued under dividend reinvestment plan (in shares)	355	761	1,169	1,533
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	696	696	696	696
Performance units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	0	316	0	210