Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income (Numerator)
Income from continuing operations after income taxes		$ 396	$ 410	$ 1,198	$ 1,029
Less amounts allocated to participating securities		2	2	5	5
Income from continuing operations after income taxes available to PPL shareowners - Basic		394	408	1,193	1,024
Plus interest charges (net of tax) related to Equity Units		0	0	0	9	[1]
Income from continuing operations after income taxes available to PPL shareowners - Diluted		394	408	1,193	1,033
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted		(3)	87	(915)	13
Net income		393	497	283	1,042
Less amounts allocated to participating securities		2	2	1	5
Net income available to PPL common shareowners - Basic		391	495	282	1,037
Plus interest charges (net of tax) related to Equity Units		0	0	0	9	[1]
Net income available to PPL common shareowners - Diluted		$ 391	$ 495	$ 282	$ 1,046
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)		670,763	664,432	668,731	649,561
Add incremental non-participating securities:
Share-based payment awards (in shares)		2,939	1,970	2,523	1,860
Equity Units (in shares)		0	0	0	14,080	[1]
Weighted-average shares - Diluted EPS (in shares)		673,702	666,402	671,254	665,501
Basic EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)		$ 0.59	$ 0.61	$ 1.78	$ 1.58
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)		(0.01)	0.13	(1.36)	0.02
Net Income Available to PPL common shareowners (in dollars per share)		0.58	0.74	0.42	1.6
Diluted EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)		0.59	0.61	1.78	1.55
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)		(0.01)	0.13	(1.36)	0.02
Net Income Available to PPL common shareowners (in dollars per share)		$ 0.58	$ 0.74	$ 0.42	$ 1.57
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	[2]	1,368	210	3,805	2,228
Common stock issued under DRIP (in shares)		475	425	1,318	425
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS		1,484	527	1,218	1,901
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS		0	0	49	0
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS		0	0	0	41

[1] In 2014, the If-Converted Method was applied to the Equity Units prior to the March 2014 settlement.

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