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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Quarterly Financial Information Disclosure [Line Items]
Operating Revenues		$ 1,939	$ 1,872	$ 1,848	$ 2,126	$ 1,926	$ 1,845	$ 1,725	$ 1,951	$ 7,785		$ 7,447		$ 7,517
Operating income		657	686	658	851	749	736	658	758	2,852		2,901		2,936
Net income		$ 415	$ 445	$ 515	$ 452	$ 78	$ 355	$ 292	$ 403	$ 1,827		$ 1,128		$ 1,902
Net income (loss) available to PPL common shareowners: [Abstract]
Basic (in dollars per share)		$ 0.57	$ 0.63	$ 0.74	$ 0.65	$ 0.11	$ 0.52	$ 0.43	$ 0.59	$ 2.59		$ 1.64		$ 2.80
Diluted (in dollars per share)		0.57	0.62	0.73	0.65	0.11	0.51	0.43	0.59	2.58		1.64		2.79
Dividends declared per share of common stock (in dollars per share)	$ 0.410	$ 0.41	$ 0.41	$ 0.41	$ 0.41	$ 0.395	$ 0.395	$ 0.395	$ 0.395	$ 1.64		$ 1.58		$ 1.52
PPL Electric Utilities Corp [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating Revenues		$ 573	$ 548	$ 517	$ 639	$ 575	$ 547	$ 500	$ 573	$ 2,277		$ 2,195		$ 2,156
Operating income		155	178	133	228	196	189	155	160	694		700		661
Net income		$ 96	$ 111	$ 75	$ 148	$ 111	$ 95	$ 77	$ 79	$ 430	[1]	$ 362	[1]	$ 340	[1]

[1] Net income equals comprehensive income.