Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	$ 184	$ 198	$ 422	$ 452
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	184	198	422	452
PPL Electric Utilities Corp [Member] | Affiliated Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	$ 74	$ 59	$ 156	$ 120