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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.

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