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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Earnings Reinvested [Member] | Accumulated Other Comprehensive Loss [Member] | PPL Electric Utilities Corp [Member] | PPL Electric Utilities Corp [Member] Common Stock [Member] | PPL Electric Utilities Corp [Member] Additional Paid-in Capital [Member] | PPL Electric Utilities Corp [Member] Earnings Reinvested [Member] | LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Co [Member] | Louisville Gas And Electric Co [Member] Common Stock [Member] | Louisville Gas And Electric Co [Member] Additional Paid-in Capital [Member] | Louisville Gas And Electric Co [Member] Earnings Reinvested [Member] | Kentucky Utilities Co [Member] | Kentucky Utilities Co [Member] Common Stock [Member] | Kentucky Utilities Co [Member] Additional Paid-in Capital [Member] | Kentucky Utilities Co [Member] Earnings Reinvested [Member] | Kentucky Utilities Co [Member] Accumulated Other Comprehensive Loss [Member]
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Balance at beginning of period - shares at Dec. 31, 2016 |  |  | 679,731 | [1] |  |  |  |  |  | 66,368 | [2] |  |  |  |  |  |  | 21,294 | [3] |  |  |  |  | 37,818 | [4] |  |  |
Balance at beginning of period at Dec. 31, 2016 |  | $ 9,899 | $ 7 |  | $ 9,841 | $ 3,829 | $ (3,778) | $ 3,391 |  | $ 364 |  | $ 2,154 | $ 873 |  |  | $ 2,476 |  | $ 424 |  | $ 1,682 | $ 370 | $ 3,323 |  | $ 308 |  | $ 2,616 | $ 400 | $ (1)
Balance at beginning of period at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | [1] |  | 5,742 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 202 |  |  | 202 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  | (20) |  |  | (20) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 695 |  |  |  | 695 |  | 156 | [5] |  |  |  | 156 | 190 | [6] | 96 | [5] |  |  |  | 96 | 119 | [6] |  |  |  | 119 |
Capital contributions from parent |  |  |  |  |  |  |  | 575 |  |  |  | 575 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and dividend equivalents |  | (541) |  |  |  | (541) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  |  | (154) |  |  |  |  | (154) |  |  | (122) |  |  |  |  | (122) | (110) |  |  |  |  | (110) |
Distributions to member |  |  |  |  |  |  |  |  |  |  |  |  |  | (218) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 255 |  |  |  |  | 255 |  |  |  |  |  |  | (7) |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Balance at end of period - shares at Jun. 30, 2017 |  |  | 685,473 | [1] |  |  |  |  |  | 66,368 | [2] |  |  |  |  |  |  | 21,294 | [3] |  |  |  |  | 37,818 | [4] |  |  |
Balance at end of period at Jun. 30, 2017 |  | $ 10,490 | $ 7 |  | 10,023 | 3,983 | (3,523) | $ 3,968 |  | $ 364 |  | 2,729 | 875 |  |  | $ 2,450 |  | $ 424 |  | 1,682 | 344 | $ 3,333 |  | $ 308 |  | 2,616 | 409 | 0
Balance at end of period at Jun. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,632 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period - shares at Dec. 31, 2017 |  | 693,398 | 693,398 | [1] |  |  |  | 66,368 |  | 66,368 | [2] |  |  |  |  | 21,294 |  | 21,294 | [3] |  |  | 37,818 |  | 37,818 | [4] |  |  |
Balance at beginning of period at Dec. 31, 2017 |  | $ 10,761 | $ 7 |  | 10,305 | 3,871 | (3,422) | $ 3,992 |  | $ 364 |  | 2,729 | 899 |  |  | $ 2,527 |  | $ 424 |  | 1,712 | 391 | $ 3,357 |  | $ 308 |  | 2,616 | 433 | 0
Balance at beginning of period at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,563 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | [1] |  | 5,730 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 163 |  |  | 163 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  | (6) |  |  | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 967 |  |  |  | 967 |  | 223 | [5] |  |  |  | 223 | 228 | [6] | 122 | [5] |  |  |  | 122 | 148 | [6] |  |  |  | 148 |
Capital contributions from parent |  |  |  |  |  |  |  | 425 |  |  |  | 425 |  |  |  | 43 |  |  |  | 43 |  | 45 |  |  |  | 45 |  |
Dividends and dividend equivalents |  | (572) |  |  |  | (572) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  |  | $ (222) |  |  |  |  | (222) |  |  | $ (81) |  |  |  |  | (81) | $ (136) |  |  |  |  | (136) |
Distributions to member |  |  |  |  |  |  |  |  |  |  |  |  |  | (161) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | $ (73) |  |  |  |  | (73) |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period - shares at Jun. 30, 2018 |  | 699,128 | 699,128 | [1] |  |  |  | 66,368 |  | 66,368 | [2] |  |  |  |  | 21,294 |  | 21,294 | [3] |  |  | 37,818 |  | 37,818 | [4] |  |  |
Balance at end of period at Jun. 30, 2018 |  | $ 11,240 | $ 7 |  | $ 10,462 | $ 4,266 | $ (3,495) | $ 4,418 |  | $ 364 |  | $ 3,154 | $ 900 |  |  | $ 2,611 |  | $ 424 |  | $ 1,755 | $ 432 | $ 3,414 |  | $ 308 |  | $ 2,661 | $ 445 | $ 0
Balance at end of period at Jun. 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,632 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Shares in thousands. Each share entitles the holder to one vote on any question presented at any shareowners' meeting.
[2] | Shares in thousands. All common shares of PPL Electric stock are owned by PPL.
[3] | Shares in thousands. All common shares of LG&E stock are owned by LKE.
[4] | Shares in thousands. All common shares of KU stock are owned by LKE.
[5] | Net income equals comprehensive income.
[6] | Net income approximates comprehensive income.

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