Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	$ 225	$ 222	$ 647	$ 674
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	225	222	647	674
PPL Electric Utilities Corp [Member] | Affiliated Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	$ 81	$ 71	$ 237	$ 191