SCHEDULE I - CONDENSED UNCONSOLIDATED BALANCE SHEETS (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 1,751		$ 1,102		$ 901	$ 1,202
Accounts Receivable [Abstract]
Other	171		97
Accounts receivable	923		923
Prepayments	87		153
Deferred income taxes	129		246
Price risk management assets	1,158		942
Other current assets	32		37
Total Current Assets	6,159		5,153
Other Noncurrent Assets [Abstract]
Other noncurrent assets	312		357
Total Other Noncurrent Assets	7,123		7,112
Total Assets	48,864		46,259
Current Liabilities [Abstract]
Short-term debt	1,466		701
Long-term debt due within one year	1,535		315
Dividends	249		232
Price risk management liabilities	1,126		829
Taxes	230		114
Other current liabilities	1,076		998
Total Current Liabilities	7,443		4,912
Long-term Debt [Abstract]
Long-term Debt	18,856		20,592
Total Deferred Credits and Other Noncurrent Liabilities	8,937		8,289
Equity [Abstract]
Common stock	7	[1]	6	[1]
Additional paid-in capital	9,433		8,316
Earnings reinvested	6,462		5,709
Accumulated other comprehensive income (loss)	(2,274)		(1,565)		(1,940)	(788)
Total Equity	13,628		12,466
Total Liabilities and Equity	48,864		46,259
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	665,849		630,321
Common stock shares outstanding	665,849		630,321
PPL Corp [Member]
Accounts Receivable [Abstract]
Other	53		28
Accounts receivable from affiliates	149		24
Prepayments	0		2
Deferred income taxes	34		0
Price risk management assets	148		190
Total Current Assets	384		244
Investments [Abstract]
Affiliated companies at equity	15,426		14,892
Other Noncurrent Assets [Abstract]
Other noncurrent assets	88		73
Total Assets	15,898		15,209
Current Liabilities [Abstract]
Short-term debt with affiliates	170		1,083
Accounts payable to affiliates	1,513		1,251
Dividends	249		233
Price risk management liabilities	227		75
Other current liabilities	70		46
Total Current Liabilities	2,229		2,688
Long-term Debt [Abstract]
Total Deferred Credits and Other Noncurrent Liabilities	41		55
Equity [Abstract]
Common stock	7	[1]	6	[1]
Additional paid-in capital	9,433		8,316
Earnings reinvested	6,462		5,709
Accumulated other comprehensive income (loss)	(2,274)		(1,565)
Total Equity	13,628		12,466
Total Liabilities and Equity	15,898		15,209
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	665,849		665,849
Common stock shares outstanding	630,321		630,321
L G And E And K U Energy L L C Unconsolidated [Member]
Current Assets
Cash and cash equivalents	0		6		0	2
Accounts Receivable [Abstract]
Accounts receivable	8		2
Accounts receivable from affiliates	0		11
Notes receivable from affiliates	1,127		1,682
Other current assets	2		10
Total Current Assets	1,137		1,711
Investments [Abstract]
Affiliated companies at equity	4,818		4,519
Other Noncurrent Assets [Abstract]
Deferred income taxes	203		170
Other noncurrent assets	5		6
Total Other Noncurrent Assets	208		176
Total Assets	6,163		6,406
Current Liabilities [Abstract]
Short-term debt	75		75
Notes payable to affiliates	58		0
Long-term debt due within one year	400		0
Accounts payable to affiliates	451		843
Taxes	2		12
Other current liabilities	8		6
Total Current Liabilities	994		936
Long-term Debt [Abstract]
Long-term Debt	722		1,121
Notes payable to affiliates	196		196
Total Long-term Debt	918		1,317
Total Deferred Credits and Other Noncurrent Liabilities	3		3
Equity [Abstract]
Members Equity	4,248		4,150
Total Liabilities and Equity	$ 6,163		$ 6,406

[1] 780,000 shares authorized; 665,849 and 630,321 shares issued and outstanding at December 31, 2014 and 2013.