Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Income (Numerator)
Income from continuing operations after income taxes attributable to PPL shareowners	$ 409		$ 355		$ 1,226		$ 1,173
Less amounts allocated to participating securities	2		2		6		7
Income from continuing operations after income taxes available to PPL shareowners - Basic	407		353		1,220		1,166
Plus interest charges (net of tax) related to Equity Units	7				37
Income from continuing operations after income taxes available to PPL shareowners - Diluted	414		353		1,257		1,166
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted	1				2		(6)
Net income attributable to PPL shareowners	410		355		1,228		1,167
Less amounts allocated to participating securities	2		2		6		7
Net income available to PPL common shareowners - Basic	408		353		1,222		1,160
Plus interest charges (net of tax) related to Equity Units	7				37
Net income available to PPL common shareowners - Diluted	$ 415		$ 353		$ 1,259		$ 1,160
Shares of Common Stock (Denominator)
Weighted-average shares - Basic EPS (in shares)	631,046		580,585		601,275		579,847
Add incremental non-participating securities:
Share-based payment awards (in shares)	1,163		635		1,035		522
Equity Units (in shares)	32,134		439		59,171		146
Forward sale agreements (in shares)			977		613		415
Weighted-average shares - Diluted EPS (in shares)	664,343		582,636		662,094		580,930
Basic EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)	$ 0.65		$ 0.61		$ 2.03		$ 2.01
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)							$ (0.01)
Net Income (in dollars per share)	$ 0.65		$ 0.61		$ 2.03		$ 2.00
Diluted EPS - Available to PPL common shareowners:
Income from continuing operations after income taxes (in dollars per share)	$ 0.62		$ 0.61		$ 1.90		$ 2.01
Income (loss) from discontinued operations (net of income taxes) (in dollars per share)							$ (0.01)
Net Income (in dollars per share)	$ 0.62		$ 0.61		$ 1.90		$ 2.00
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	85	[1]	159	[1]	1,469	[1]	512	[1]
Common stock issued under ESOP (in shares)					275		280
Common stock issued under DRIP (in shares)			598		549		1,773
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	1,136		4,935		4,793		5,622
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	1				73		76
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS					39

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