Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2017	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
Quarterly Financial Information Disclosure [Line Items]
Operating Revenues		$ 1,926	$ 1,845	$ 1,725	$ 1,951	$ 1,832	$ 1,889	$ 1,785	$ 2,011	$ 7,447		$ 7,517		$ 7,669
Operating income		793	777	702	796	714	786	725	823	3,068		3,048		2,831
Income from continuing operations after income taxes										1,128		1,902		1,603
Loss from Discontinued Operations (net of income taxes)										0		0		(921)
Net income (loss)		$ 78	$ 355	$ 292	$ 403	$ 465	$ 473	$ 483	$ 481	$ 1,128		$ 1,902		$ 682
Income from continuing operations after income taxes available to PPL common shareowners: [Abstract]
Basic (in dollars per share)										$ 1.64		$ 2.80		$ 2.38
Diluted (in dollars per share)										1.64		2.79		2.37
Net income (loss) available to PPL common shareowners: [Abstract]
Basic (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 (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
Dividends declared per share of common stock (in dollars per share)	$ 0.395	0.3950	0.3950	0.3950	0.3950	0.38	0.38	0.38	0.38	$ 1.58		$ 1.52		$ 1.50
Price per common share: [Abstract]
High (in dollars per share)		38.37	39.83	40.06	37.70	34.74	37.71	39.68	38.07
Low (in dollars per share)		$ 30.76	$ 37.36	$ 37.11	$ 33.94	$ 32.19	$ 33.63	$ 36.27	$ 32.80
PPL Energy Supply Spinoff [Member]
Quarterly Financial Information Disclosure [Line Items]
Loss from Discontinued Operations (net of income taxes)														$ (921)
Price per common share: [Abstract]
Gain (loss) on disposal group														(879)
PPL Electric Utilities Corp [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating Revenues		$ 575	$ 547	$ 500	$ 573	$ 537	$ 539	$ 495	$ 585	$ 2,195		$ 2,156		2,124
Operating income		197	189	156	159	154	176	154	180	701		664		538
Net income (loss)		$ 111	$ 95	$ 77	$ 79	$ 77	$ 90	$ 79	$ 94	$ 362	[1]	$ 340	[1]	$ 252	[1]

[1] Net income equals comprehensive income.