Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income (Numerator) [Abstract]
Net Income	$ 292	$ 483	$ 695	$ 964
Less amounts allocated to participating securities	0	1	1	3
Net income available to PPL common shareowners - Basic	292	482	694	961
Net income available to PPL common shareowners - Diluted	$ 292	$ 482	$ 694	$ 961
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	683,841	677,145	682,370	676,293
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	2,510	3,584	2,355	3,480
Weighted-average shares - Diluted EPS (in shares)	686,351	680,729	684,725	679,773
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.43	$ 0.71	$ 1.02	$ 1.42
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.43	$ 0.71	$ 1.01	$ 1.41
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	564	795	1,451	2,920
Common stock issued under dividend reinvestment plan (in shares)	369	370	814	772
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	78	0	39