SCHEDULE I - PPL CORPORATION CONDENSED UNCONSOLIDATED BALANCE SHEETS (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2008
Accounts Receivable [Abstract]
Other	$ 85		$ 90
Prepayments	160		435
Price risk management assets	2,548		1,918
Total Current Assets	6,426		6,188
Investments [Abstract]
Other Noncurrent Assets	8,238		5,133
Total Assets	42,648		32,837
Current Liabilities [Abstract]
Dividends	207		174
Price risk management liabilities	1,570		1,144
Other current liabilities	1,113		925
Total Current Liabilities	5,255		5,214
Deferred Credits and Other Noncurrent Liabilities	8,304		6,984
PPL Corporation Shareowners' Common Equity [Abstract]
Common stock	6	[1]	5	[1]
Additional paid-in capital	6,813		4,602
Earnings reinvested	4,797		4,082
Accumulated other comprehensive loss	(788)		(479)		(537)	(985)
Total PPL Corporation Shareowners' Common Equity	10,828		8,210
Total Liabilities and Equity	42,648		32,837
PPL Corporation Shareowners' Common Equity Additional Information [Abstract]
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]
Accounts Receivable [Abstract]
Other	5		6
Affiliate	25		29
Prepayments	36		121
Deferred income taxes	8		11
Price risk management assets	23		15
Total Current Assets	97		182
Investments [Abstract]
Affiliated companies at equity	14,181		13,406
Other Noncurrent Assets	80		32
Total Assets	14,358		13,620
Current Liabilities [Abstract]
Short-term debt with affiliates	1,991		4,062
Accounts payable with affiliates	1,095		958
Dividends	203		170
Price risk management liabilities	23		22
Other current liabilities	98		55
Total Current Liabilities	3,410		5,267
Deferred Credits and Other Noncurrent Liabilities	120		143
PPL Corporation Shareowners' Common Equity [Abstract]
Common stock	6	[1]	5	[1]
Additional paid-in capital	6,813		4,602
Earnings reinvested	4,797		4,082
Accumulated other comprehensive loss	(788)		(479)
Total PPL Corporation Shareowners' Common Equity	10,828		8,210
Total Liabilities and Equity	$ 14,358		$ 13,620
PPL Corporation Shareowners' Common Equity Additional Information [Abstract]
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

[1] 780,000 shares authorized; 578,405 and 483,391 shares issued and outstanding at December 31, 2011 and December 31, 2010.