SCHEDULE I - CONDENSED UNCONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents		$ 708	$ 815
Accounts Receivable [Abstract]
Other		91	105
Accounts receivable		790	687
Prepayments		96	79
Price risk management assets		94	147
Other current assets		130	98
Total Current Assets		2,768	2,767
Other Noncurrent Assets [Abstract]
Price risk management assets		52	149
Other noncurrent assets		398	386
Total Other Noncurrent Assets		6,456	6,431
Total Assets		48,116	45,680
Current Liabilities [Abstract]
Short-term debt		1,662	1,151
Long-term debt due within one year		1,574	1,172
Dividends		319	317
Taxes		91	99
Other current liabilities		684	535
Total Current Liabilities		5,977	4,900
Long-term Debt [Abstract]
Long-term Debt		21,553	20,721
Total Deferred Credits and Other Noncurrent Liabilities		7,213	7,068
Equity [Abstract]
Common stock	[1]	8	8
Additional paid-in capital		12,270	12,214
Earnings reinvested		5,315	5,127
Accumulated other comprehensive loss		(4,220)	(4,358)	$ (3,964)	$ (3,422)
Total Equity		13,373	12,991	11,657	10,761
Total Liabilities and Equity		$ 48,116	$ 45,680
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		768,907	767,233
Common stock shares outstanding		768,907	767,233
LG&E and KU Energy LLC Unconsolidated [Member]
Current Assets
Cash and cash equivalents		$ 0	$ 0	$ 0	$ 0
Accounts Receivable [Abstract]
Accounts receivable from affiliates		4	3
Income Taxes Receivable, Current		2	3
Notes receivable from affiliates		1,100	1,105
Total Current Assets		1,106	1,111
Investments [Abstract]
Affiliated companies at equity		5,944	5,577
Other Noncurrent Assets [Abstract]
Deferred income taxes		276	314
Total Assets		7,326	7,002
Current Liabilities [Abstract]
Notes payable to affiliates		251	150
Long-term debt due within one year		250	475
Accounts payable with affiliates		499	489
Taxes		5	0
Other current liabilities		2	6
Total Current Liabilities		1,007	1,120
Long-term Debt [Abstract]
Long-term debt		0	249
Notes payable to affiliates		1,203	691
Long-term Debt		1,203	940
Total Deferred Credits and Other Noncurrent Liabilities		0	0
Equity [Abstract]
Members Equity		5,116	4,942
Total Liabilities and Equity		$ 7,326	$ 7,002

[1] 1,560,000 shares authorized; 768,907 and 767,233 shares issued and outstanding at December 31, 2020 and December 31, 2019.