CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 46		$ 64
Equity
Common stock par value	$ 0.01		$ 0.01
Common stock shares authorized	780,000		780,000
Common stock shares issued	665,849		630,321
Common stock shares outstanding	665,849		630,321
PPL Energy Supply LLC [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	2		21
PPL Electric Utilities Corp [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	17		18
Equity
Common stock no par value
Common stock shares authorized	170,000		170,000
Common stock shares issued	66,368		66,368
Common stock shares outstanding	66,368	[1]	66,368	[1]
LG And E And KU Energy LLC [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	25		22
Louisville Gas And Electric Co [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	2		2
Equity
Common stock no par value
Common stock shares authorized	75,000		75,000
Common stock shares issued	21,294		21,294
Common stock shares outstanding	21,294		21,294
Kentucky Utilities Co [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 2		$ 4
Equity
Common stock no par value
Common stock shares authorized	80,000		80,000
Common stock shares issued	37,818		37,818
Common stock shares outstanding	37,818		37,818

[1] Shares in thousands. All common shares of PPL Electric stock are owned by PPL.