Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	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
Income (Numerator)
Income from continuing operations after income taxes attributable to PPL shareowners																	$ 1,583		$ 1,096		$ 1,486
Less amounts allocated to participating securities																	8		6		8
Less issuance costs on subsidiary's preferred securities redeemed																	0		0		6
Income from continuing operations after income taxes available to PPL common shareowners - Basic																	1,575		1,090		1,472
Plus interest charges (net of tax) related to Equity Units																	9	[1]	44	[1]	0
Income from continuing operations after income taxes available to PPL common shareowners - Diluted																	1,584		1,134		1,472
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted	144	[2],[3]	7	[2]	11	[2]	(8)	[2]	4	[2]	7	[2]	15	[2]	8	[2]	154		34		40
Net income attributable to PPL shareowners	695	[2]	497	[2]	229	[2]	316	[2]	(98)	[2],[4]	410	[2]	405	[2]	413	[2]	1,737		1,130		1,526
Less amounts allocated to participating securities																	9		6		8
Less issuance costs on subsidiary's preferred securities redeemed																	0		0		6
Net income available to PPL common shareowners - Basic																	1,728		1,124		1,512
Plus interest charges (net of tax) related to Equity Units																	9		44		0
Net income available to PPL common shareowners - Diluted																	$ 1,737		$ 1,168		$ 1,512
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)																	653,504		608,983		580,276
Add incremental non-participating securities:
Share-based payment awards (in shares)																	1,910		1,062		563	[5]
Equity Units (in shares)																	10,559	[1]	52,568	[1]	0
Forward sale agreements and Purchase Contracts (in shares)																	0		460		787	[5]
Weighted-average shares - Diluted EPS (in shares)																	665,973		663,073		581,626
Basic EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)	$ 0.82	[2],[6]	$ 0.73	[2],[6]	$ 0.33	[2],[6]	$ 0.51	[2],[6]	$ (0.16)	[2],[4],[6]	$ 0.64	[2],[6]	$ 0.66	[2],[6]	$ 0.69	[2],[6]	$ 2.41		$ 1.79		$ 2.55
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)																	$ 0.23		$ 0.06		$ 0.06
Net Income (in dollars per share)	$ 1.04	[2],[6]	$ 0.74	[2],[6]	$ 0.35	[2],[6]	$ 0.5	[2],[6]	$ (0.16)	[2],[4],[6]	$ 0.65	[2],[6]	$ 0.68	[2],[6]	$ 0.7	[2],[6]	$ 2.64		$ 1.85		$ 2.61
Diluted EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)	$ 0.82	[2],[6]	$ 0.73	[2],[6]	$ 0.32	[2],[6]	$ 0.5	[2],[6]	$ (0.16)	[2],[4],[6],[7]	$ 0.61	[2],[6]	$ 0.61	[2],[6]	$ 0.64	[2],[6]	$ 2.38		$ 1.71		$ 2.54
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)																	$ 0.23		$ 0.05		$ 0.06
Net Income (in dollars per share)	$ 1.04	[2],[6]	$ 0.74	[2],[6]	$ 0.34	[2],[6]	$ 0.49	[2],[6]	$ (0.16)	[2],[4],[6],[7]	$ 0.62	[2],[6]	$ 0.63	[2],[6]	$ 0.65	[2],[6]	$ 2.61		$ 1.76		$ 2.6
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)																	2,985	[8]
Common stock issued under DRIP (in shares)																	868
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS																	1,816		4,446		5,293
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS																	5		55		58
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS																	31		29		0

[1] In 2014 and 2013, the If-Converted Method was applied to the Equity Units prior to settlement. See Note 7 for additional information on the Equity Units, including the issuance of PPL common stock to settle the Purchase contracts.

[2] 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.

[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] 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.

[5] The Treasury Stock Method was applied to non-participating share-based payment awards, forward sale agreements and the 2010 Purchase Contracts

[6] 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.

[7] 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.

[8] Includes stock options exercised, vesting of performance units, vesting of restricted stock and restricted stock units and conversion of stock units granted to directors.