Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income (Numerator)
Income from continuing operations after income taxes									$ 1,128	$ 1,902	$ 1,603
Less amounts allocated to participating securities									2	6	6
Income from continuing operations after income taxes available to PPL common shareowners - Basic									1,126	1,896	1,597
Income from continuing operations after income taxes available to PPL common shareowners - Diluted									1,126	1,896	1,597
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic									0	0	(921)
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Diluted									0	0	(921)
Net income	$ 78	$ 355	$ 292	$ 403	$ 465	$ 473	$ 483	$ 481	1,128	1,902	682
Less amounts allocated to participating securities									2	6	2
Net income available to PPL common shareowners - Basic									1,126	1,896	680
Net income available to PPL common shareowners - Diluted									$ 1,126	$ 1,896	$ 680
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)									685,240	677,592	669,814
Add incremental non-participating securities:
Share-based payment awards (in shares)									2,094	2,854	2,772
Weighted-average shares - Diluted EPS (in shares)									687,334	680,446	672,586
Basic EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)									$ 1.64	$ 2.80	$ 2.38
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)									0.00	0.00	(1.37)
Net Income (in dollars per share)	$ 0.11	$ 0.52	$ 0.43	$ 0.59	$ 0.68	$ 0.70	$ 0.71	$ 0.71	1.64	2.80	1.01
Diluted EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)									1.64	2.79	2.37
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)									0.00	0.00	(1.36)
Net Income (in dollars per share)	$ 0.11	$ 0.51	$ 0.43	$ 0.59	$ 0.68	$ 0.69	$ 0.71	$ 0.71	$ 1.64	$ 2.79	$ 1.01
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)									1,748
Common stock issued under DRIP (in shares)									1,552
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS									696	696	1,087
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS									0	176	36