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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Receivables, Net, Current [Abstract] |  |
Accounts receivable reserve for doubtful accounts | $ 61 | $ 71
Unbilled revenues, reserve | 2 | 4
Reserve for accounts receivable (noncurrent) | $ 5 | $ 0
Equity |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock shares authorized (in shares) | 1,560,000 | 1,560,000
Common stock shares issued (in shares) | 769,723 | 768,907
Common stock shares outstanding (in shares) | 760,109 | 768,907
PPL Electric Utilities Corp [Member] |  |
Receivables, Net, Current [Abstract] |  |
Accounts receivable reserve for doubtful accounts | $ 30 | $ 41
Unbilled revenues, reserve | 1 | 2
Reserve for accounts receivable (noncurrent) | $ 5 | $ 0
Equity |  |
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock shares authorized (in shares) | 170,000 | 170,000
Common stock shares issued (in shares) | 66,368 | 66,368
Common stock shares outstanding (in shares) | 66,368 | 66,368
Louisville Gas And Electric Co [Member] |  |
Receivables, Net, Current [Abstract] |  |
Accounts receivable reserve for doubtful accounts | $ 2 | $ 2
Unbilled revenues, reserve | $ 1 | $ 1
Equity |  |
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock shares authorized (in shares) | 75,000 | 75,000
Common stock shares issued (in shares) | 21,294 | 21,294
Common stock shares outstanding (in shares) | 21,294 | 21,294
Kentucky Utilities Co [Member] |  |
Receivables, Net, Current [Abstract] |  |
Accounts receivable reserve for doubtful accounts | $ 1 | $ 1
Unbilled revenues, reserve | $ 1 | $ 1
Equity |  |
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock shares authorized (in shares) | 80,000 | 80,000
Common stock shares issued (in shares) | 37,818 | 37,818
Common stock shares outstanding (in shares) | 37,818 | 37,818

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