Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Income (Numerator)
Income from continuing operations after income taxes attributable to PPL shareowners	$ 404		$ 277		$ 817		$ 818
Less amounts allocated to participating securities	2		2		4		5
Income from continuing operations after income taxes available to PPL shareowners - Basic	402		275		813		813
Plus interest charges (net of tax) related to Equity Units	15				30
Income from continuing operations after income taxes available to PPL shareowners - Diluted	417		275		843		813
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted	1		(6)		1		(6)
Net income attributable to PPL shareowners	405		271		818		812
Less amounts allocated to participating securities	2		2		4		5
Net income available to PPL common shareowners - Basic	403		269		814		807
Plus interest charges (net of tax) related to Equity Units	15				30
Net income available to PPL common shareowners - Diluted	$ 418		$ 269		$ 844		$ 807
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)	589,834		579,881		586,683		579,462
Add incremental non-participating securities:
Share-based payment awards (in shares)	1,133		444		971		465
Equity Units (in shares)	73,388				72,689
Forward sale agreements (in shares)	260		268		920		135
Weighted-average shares - Diluted EPS (in shares)	664,615		580,593		661,263		580,062
Basic EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)	$ 0.68		$ 0.47		$ 1.39		$ 1.40
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)			$ (0.01)				$ (0.01)
Net Income (in dollars per share)	$ 0.68		$ 0.46		$ 1.39		$ 1.39
Diluted EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)	$ 0.63		$ 0.47		$ 1.28		$ 1.40
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)			$ (0.01)				$ (0.01)
Net Income (in dollars per share)	$ 0.63		$ 0.46		$ 1.28		$ 1.39
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	938	[1]	76	[1]	1,384	[1]	353	[1]
Common stock issued under ESOP (in shares)					275		280
Common stock issued under DRIP (in shares)			617		549		1,175
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	2,192		6,250		5,486		5,966
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	5		34		108		115
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS					58

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