CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 54	$ 55
Property, Plant and Equipment
PP&E, net from the consolidation of a VIE	416	424
Other Noncurrent Assets
Other intangibles from the consolidation of a VIE	11	11
PPL Corporation Shareowners' Common Equity
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	780,000	780,000
Common stock shares issued	578,405	483,391
Common stock shares outstanding	578,405	483,391
PPL Corp [Member]
PPL Corporation Shareowners' Common Equity
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	780,000	780,000
Common stock shares issued	578,405	483,391
Common stock shares outstanding	578,405	483,391
PPL Energy Supply [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	15	20
Property, Plant and Equipment
PP&E, net from the consolidation of a VIE	416	424
Other Noncurrent Assets
Other intangibles from the consolidation of a VIE	11	11
PPL Electric [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	17	17
PPL Corporation Shareowners' Common Equity
Common stock shares authorized	170,000	170,000
Common stock shares issued	66,368	66,368
Common stock shares outstanding	66,368	66,368
LKE [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	17	17
LGE [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	2	2
PPL Corporation Shareowners' Common Equity
Common stock par value	$ 0	$ 0
Common stock shares authorized	75,000	75,000
Common stock shares issued	21,294	21,294
Common stock shares outstanding	21,294	21,294
KU [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 2	$ 6
PPL Corporation Shareowners' Common Equity
Common stock par value	$ 0	$ 0
Common stock shares authorized	80,000	80,000
Common stock shares issued	37,818	37,818
Common stock shares outstanding	37,818	37,818