Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended																12 Months Ended
	Nov. 30, 2014	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Quarterly Financial Information Disclosure [Line Items]
Operating revenues		$ 4,023	[1]	$ 3,449	[1]	$ 2,833	[1]	$ 1,194	[1]	$ 2,819	[1]	$ 3,074	[1]	$ 3,403	[1]	$ 2,425	[1]	$ 11,499		$ 11,721		$ 12,132
Operating income		983	[1]	869	[1]	697	[1]	723	[1]	21	[1],[2]	846	[1]	732	[1]	679	[1]	3,272		2,278		3,026
Income from continuing operations after income taxes		551	[1]	490	[1]	218	[1]	324	[1]	(102)	[1],[2]	404	[1]	390	[1]	405	[1]	1,583		1,097		1,491
Income (loss) from Discontinued Operations		144	[1],[3]	7	[1]	11	[1]	(8)	[1]	4	[1]	7	[1]	15	[1]	8	[1]	154		34		40
Net income		695	[1],[3]	497	[1]	229	[1]	316	[1]	(98)	[1],[2]	411	[1]	405	[1]	413	[1]	1,737		1,131		1,531
Net income attributable to PPL shareowners		695	[1]	497	[1]	229	[1]	316	[1]	(98)	[1],[2]	410	[1]	405	[1]	413	[1]	1,737		1,130		1,526
Income from continuing operations after income taxes available to PPL common shareowners: [Abstract]
Basic (in dollars per share)		$ 0.82	[1],[4]	$ 0.73	[1],[4]	$ 0.33	[1],[4]	$ 0.51	[1],[4]	$ (0.16)	[1],[2],[4]	$ 0.64	[1],[4]	$ 0.66	[1],[4]	$ 0.69	[1],[4]	$ 2.41		$ 1.79		$ 2.55
Diluted (in dollars per share)		$ 0.82	[1],[4]	$ 0.73	[1],[4]	$ 0.32	[1],[4]	$ 0.5	[1],[4]	$ (0.16)	[1],[2],[4],[5]	$ 0.61	[1],[4]	$ 0.61	[1],[4]	$ 0.64	[1],[4]	$ 2.38		$ 1.71		$ 2.54
Dividends declared per share of common stock (in dollars per share)	$ 0.3725	$ 0.3725	[1],[6]	$ 0.3725	[1],[6]	$ 0.3725	[1],[6]	$ 0.3725	[1],[6]	$ 0.3675	[1],[6]	$ 0.3675	[1],[6]	$ 0.3675	[1],[6]	$ 0.3675	[1],[6]	$ 1.49		$ 1.47		$ 1.44
Net income available to PPL common shareowners: [Abstract]
Basic (in dollars per share)		$ 1.04	[1],[4]	$ 0.74	[1],[4]	$ 0.35	[1],[4]	$ 0.5	[1],[4]	$ (0.16)	[1],[2],[4]	$ 0.65	[1],[4]	$ 0.68	[1],[4]	$ 0.7	[1],[4]	$ 2.64		$ 1.85		$ 2.61
Diluted (in dollars per share)		$ 1.04	[1],[4]	$ 0.74	[1],[4]	$ 0.34	[1],[4]	$ 0.49	[1],[4]	$ (0.16)	[1],[2],[4],[5]	$ 0.62	[1],[4]	$ 0.63	[1],[4]	$ 0.65	[1],[4]	$ 2.61		$ 1.76		$ 2.6
Price per common share: [Abstract]
High (in dollars per share)		$ 38.14	[1]	$ 35.52	[1]	$ 35.56	[1]	$ 33.24	[1]	$ 31.79	[1]	$ 32.09	[1]	$ 33.55	[1]	$ 31.35	[1]
Low (in dollars per share)		$ 32.09	[1]	$ 31.79	[1]	$ 32.32	[1]	$ 29.4	[1]	$ 28.95	[1]	$ 29.03	[1]	$ 28.44	[1]	$ 28.64	[1]
Montana Hydroelectric Generating Facilities [Member]
Quarterly Financial Information Disclosure [Line Items]
Income (loss) from Discontinued Operations																		154		32		46
Price per common share: [Abstract]
Gain on the sale of Montana hydroelectric generation business, after-tax																		137
As Previously Reported [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues		0		0		2,874	[1]	1,223	[1]	2,848	[1]	3,105	[1]	3,450	[1]	2,457	[1]
Operating income		0		0		718	[1]	715	[1]	31	[1]	857	[1]	758	[1]	693	[1]
Income from continuing operations after income taxes		0		0		229	[1]	316	[1]	(98)	[1]	410	[1]	404	[1]	413	[1]
Income (loss) from Discontinued Operations										0		1	[1]	1	[1]	0
Reclassification Of Discontinued Operations [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues		0		0		(41)	[1],[7]	(29)	[1],[7]	(29)	[1],[7]	(31)	[1],[7]	(47)	[1],[7]	(32)	[1],[7]
Operating income		0		0		(21)	[1],[7]	8	[1],[7]	(10)	[1],[7]	(11)	[1],[7]	(26)	[1],[7]	(14)	[1],[7]
Income from continuing operations after income taxes		0		0		(11)	[1],[7]	8	[1],[7]	(4)	[1],[7]	(6)	[1],[7]	(14)	[1],[7]	(8)	[1],[7]
Income (loss) from Discontinued Operations		0		0		11	[1],[7]	(8)	[1],[7]	4	[1],[7]	6	[1],[7]	14	[1],[7]	8	[1],[7]
PPL Electric Utilities Corp [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues		526	[8]	477	[8]	449	[8]	592	[8]	479	[8]	464	[8]	414	[8]	513	[8]	2,044		1,870		1,763
Operating income		138	[8]	124	[8]	111	[8]	165	[8]	101	[8]	105	[8]	92	[8]	121	[8]	538		419		294
Net income		69	[8]	57	[8]	52	[8]	85	[8]	49	[8]	51	[8]	45	[8]	64	[8]	263	[9]	209	[9]	136	[9]
Net income available to PPL		$ 69	[8]	$ 57	[8]	$ 52	[8]	$ 85	[8]	$ 49	[8]	$ 51	[8]	$ 45	[8]	$ 64	[8]	$ 263		$ 209		$ 132

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

[2] Fourth quarter of 2013 includes a charge for the termination of the lease of the Colstrip coal-fired electric generating facility in Montana. See Note 8 to the Financial Statements for additional information.

[3] 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 to the Financial Statements for additional information.

[4] 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.

[5] As a result of a reported loss, diluted earnings per share for the three months ended December 31, 2013 exclude incremental shares as they were anti-dilutive.

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

[7] In the third quarter of 2014, the hydroelectric generation facilities of PPL Montana met the criteria as held for sale. Accordingly, the previously reported operating results for these facilities have been reclassified as discontinued operations. See Note 8 to the Financial Statements for additional information.

[8] 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.

[9] Net income approximates comprehensive income.