Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended																12 Months Ended
		Nov. 30, 2015	Nov. 30, 2014	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information Disclosure [Line Items]
Operating Revenues				$ 1,780	[1]	$ 1,878	[1]	$ 1,781	[1]	$ 2,230	[1]	$ 1,946	[1]	$ 1,879	[1]	$ 1,849	[1]	$ 2,178	[1]	$ 7,669		$ 7,852		$ 7,263
Operating income				617	[1]	686	[1]	638	[1]	890	[1]	700	[1]	688	[1]	678	[1]	801	[1]	2,831		2,867		2,561
Income from continuing operations after income taxes				405	[1]	396	[1]	250	[1]	552	[1]	408	[1]	410	[1]	230	[1]	389	[1]	1,603		1,437		1,368
Income (Loss) from Discontinued Operations (net of income taxes)				(6)	[1]	(3)	[1]	(1,007)	[1],[2],[3]	95	[1],[2]	287	[1],[2],[4]	87	[1],[2]	(1)	[1],[2]	(73)	[1],[2]	(921)		300		(238)
Net income (loss)				$ 399	[1]	$ 393	[1]	$ (757)	[1],[3]	$ 647	[1]	$ 695	[1],[4]	$ 497	[1]	$ 229	[1]	$ 316	[1]	$ 682		$ 1,737		$ 1,130
Income from continuing operations after income taxes available to PPL common shareowners: [Abstract]
Basic (in dollars per share)				$ 0.6	[1],[5]	$ 0.59	[1],[5]	$ 0.37	[1],[5]	$ 0.83	[1],[5]	$ 0.62	[1],[5]	$ 0.61	[1],[5]	$ 0.35	[1],[5]	$ 0.61	[1],[5]	$ 2.38		$ 2.19		$ 2.24
Diluted (in dollars per share)				0.6	[1],[5]	0.59	[1],[5]	0.37	[1],[5]	0.82	[1],[5]	0.62	[1],[5]	0.61	[1],[5]	0.34	[1],[5]	0.61	[1],[5]	2.37		2.16		2.12
Net income (loss) available to PPL common shareowners: [Abstract]
Basic (in dollars per share)				0.59	[1],[5]	0.58	[1],[5]	(1.13)	[1],[5]	0.97	[1],[5]	1.04	[1],[5]	0.74	[1],[5]	0.35	[1],[5]	0.5	[1],[5]	1.01		2.64		1.85
Diluted (in dollars per share)				0.59	[1],[5]	0.58	[1],[5]	(1.13)	[1],[5]	0.96	[1],[5]	1.04	[1],[5]	0.74	[1],[5]	0.34	[1],[5]	0.49	[1],[5]	1.01		2.61		1.76
Dividends declared per share of common stock (in dollars per share)		$ 0.3775		0.3775	[1],[6]	0.3775	[1],[6]	0.3725	[1],[6]	0.3725	[1],[6]	0.3725	[1],[6]	0.3725	[1],[6]	0.3725	[1],[6]	0.3725	[1],[6]	$ 1.5		$ 1.49		$ 1.47
Price per common share: [Abstract]
High (in dollars per share)	[1]			34.75		33.58		34.85		36.38		38.14		35.52		35.56		33.24
Low (in dollars per share)	[1]			$ 32.6		$ 29.41		$ 29.45		$ 31.4		$ 32.09		$ 31.79		$ 32.32		$ 29.4
PPL Energy Supply Spinoff [Member]
Quarterly Financial Information Disclosure [Line Items]
Income (Loss) from Discontinued Operations (net of income taxes)																				$ (921)		$ 300		$ (238)
Price per common share: [Abstract]
Gain (loss) on disposal group								$ 879												(879)		0		0
Montana Hydroelectric Generating Facilities [Member]
Price per common share: [Abstract]
Gain (loss) on disposal group			$ 137									$ 137
PPL Electric Utilities Corp [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating Revenues				$ 499	[7]	$ 519	[7]	476	[7]	$ 630	[7]	526	[7]	$ 477	[7]	$ 449	[7]	$ 592	[7]	2,124		2,044		1,870
Operating income				126	[7]	121	[7]	116	[7]	175	[7]	138	[7]	124	[7]	111	[7]	165	[7]	538		538		419
Net income (loss)				$ 61	[7]	$ 55	[7]	$ 49	[7]	$ 87	[7]	$ 69	[7]	$ 57	[7]	$ 52	[7]	$ 85	[7]	$ 252	[8]	$ 263	[8]	$ 209	[8]

[1] Quarterly results can vary depending on, among other things, weather . Accordingly, comparisons among quarters of a year may not be indicative of overall tr ends and changes in operations.

[2] In the second quarter of 2015, PPL completed the spinoff of PPL Energy Supply sub stantially representing PPL's Supply segment. Accordingly, the previously reported operating results for PPL’s Supply segment have been reclassified as discontinued operations. See Note 8 to the Financial Statements for additional information.

[3] The second quarter of 2015 includes a loss of $879 million from the spinoff of PPL Energy Supply. See Note 8 to the Financial Statements for additional information.

[4] (f) The fourth quarter of 2014 includes a gain of $137 million (after-tax) from the sale of Hydroelectric generating facilities of PPL Montana. See Note 8 for additional information.

[5] The sum of the quarterly amounts may not equal annual earnings per share due to changes in the number of common shares outstanding during the year or rounding.

[6] PPL has paid quarterly cash dividends on its common stock in every year since 1946. Future d ividends, declared at the discretion of the Board of Directors, will be dependent upon future earnings, cash flows, financial requirements and other factors.

[7] PPL Electric's business is seasonal in nature, with peak sales periods generally occurring in the winter and summer months. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.

[8] Net income approximates comprehensive income.