SCHEDULE I - CONDENSED UNCONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents		$ 485	$ 341	$ 836	$ 1,399
Accounts Receivable [Abstract]
Other		100	46
Accounts receivable		681	666
Prepayments		66	63
Price risk management assets		49	63
Other current assets		50	52
Total Current Assets		2,294	2,067
Other Noncurrent Assets [Abstract]
Price risk management assets		215	336
Other noncurrent assets		135	151
Total Other Noncurrent Assets		6,093	6,174
Total Assets		41,479	38,315
Current Liabilities [Abstract]
Short-term debt		1,080	923
Long-term debt due within one year		348	518
Dividends		273	259
Taxes		105	101
Other current liabilities		624	569
Total Current Liabilities		4,023	3,837
Long-term Debt [Abstract]
Total Long-term Debt		19,847	17,808
Total Deferred Credits and Other Noncurrent Liabilities		6,848	6,771
Equity [Abstract]
Common stock	[1]	7	7
Additional paid-in capital		10,305	9,841
Earnings reinvested		3,871	3,829
Accumulated other comprehensive loss		(3,422)	(3,778)	(2,728)	(2,274)
Total Equity		10,761	9,899	9,919	13,628
Total Liabilities and Equity		$ 41,479	$ 38,315
PPL Corporation Shareowners' Common Equity Additional Information [Abstract]
Common stock par value		$ 0.01	$ 0.01
Common stock shares authorized		1,560,000	1,560,000
Common stock shares issued		693,398	679,731
Common stock shares outstanding		693,398	679,731
PPL Corp [Member]
Current Assets
Cash and cash equivalents		$ 0	$ 4	0	0
Accounts Receivable [Abstract]
Other		7	7
Accounts receivable from affiliates		17	10
Price risk management assets		196	63
Total Current Assets		220	84
Investments [Abstract]
Affiliated companies at equity		11,141	10,160
Other Noncurrent Assets [Abstract]
Deferred income taxes		46	70
Price risk management assets		186	284
Other noncurrent assets		1	1
Total Other Noncurrent Assets		233	355
Total Assets		11,594	10,599
Current Liabilities [Abstract]
Short-term debt with affiliates		157	44
Accounts payable with affiliates		2	30
Dividends		273	259
Price risk management liabilities		233	237
Other current liabilities		19	20
Total Current Liabilities		684	590
Long-term Debt [Abstract]
Total Deferred Credits and Other Noncurrent Liabilities		149	110
Equity [Abstract]
Common stock		7	7
Additional paid-in capital		10,305	9,841
Earnings reinvested		3,871	3,829
Accumulated other comprehensive loss		(3,422)	(3,778)
Total Equity		10,761	9,899
Total Liabilities and Equity		$ 11,594	$ 10,599
PPL Corporation Shareowners' Common Equity Additional Information [Abstract]
Common stock par value		$ 0.01	$ 0.01
Common stock shares authorized		1,560,000
Common stock shares issued		693,398	679,731
Common stock shares outstanding		693,398	679,731
L G And E And K U Energy L L C Unconsolidated [Member]
Current Assets
Cash and cash equivalents		$ 0	$ 1	$ 0	$ 0
Accounts Receivable [Abstract]
Accounts receivable		1	0
Accounts receivable from affiliates		8	23
Income Taxes Receivable, Current		1	31
Notes receivable from affiliates		1,035	1,007
Total Current Assets		1,045	1,062
Investments [Abstract]
Affiliated companies at equity		5,209	5,219
Other Noncurrent Assets [Abstract]
Deferred income taxes		263	227
Total Assets		6,517	6,508
Current Liabilities [Abstract]
Notes payable to affiliates		241	179
Accounts payable with affiliates		469	450
Taxes		35	0
Other current liabilities		5	6
Total Current Liabilities		750	635
Long-term Debt [Abstract]
Long-term debt		722	721
Notes payable to affiliates		476	480
Total Long-term Debt		1,198	1,201
Total Deferred Credits and Other Noncurrent Liabilities		6	5
Equity [Abstract]
Members Equity		4,563	4,667
Total Liabilities and Equity		$ 6,517	$ 6,508

[1] 1,560,000 shares authorized; 693,398 and 679,731 shares issued and outstanding at December 31, 2017 and December 31, 2016.