Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income (Numerator) [Abstract]
Net Income	$ 403	$ 481
Less amounts allocated to participating securities	1	2
Net income available to PPL common shareowners - Basic	402	479
Net income available to PPL common shareowners - Diluted	$ 402	$ 479
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	680,882	675,441
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	2,202	3,376
Weighted-average shares - Diluted EPS (in shares)	683,084	678,817
Basic EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.59	$ 0.71
Diluted EPS - Available to PPL common shareowners: [Abstract]
Net Income Available to PPL common shareowners (in dollars per share)	$ 0.59	$ 0.71
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	887	2,125
Common stock issued under dividend reinvestment plan (in shares)	445	402
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	696	696