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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, 2015 |  |  | 673,857 | [1] |  |  |  |  |  | 66,368 | [2] |  |  |  |  |  | 21,294 | [3] |  |  |  |  | 37,818 | [4] |  |  |
Balance at beginning of period at Dec. 31, 2015 |  | $ 9,919 | $ 7 |  | $ 9,687 | $ 2,953 | $ (2,728) | $ 3,119 |  | $ 364 |  | $ 1,934 | $ 821 |  | $ 2,330 |  | $ 424 |  | $ 1,611 | $ 295 | $ 3,287 |  | $ 308 |  | $ 2,596 | $ 383 | $ 0
Balance at beginning of period at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,517 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | [1] |  | 3,692 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 109 |  |  | 109 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  | (30) |  |  | (30) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 964 |  |  |  | 964 |  | 173 | [5] |  |  |  | 173 | 204 | 96 | [5] |  |  |  | 96 | 129 | [6] |  |  |  | 129 |
Contributions from member |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  |  |  |  |  |  |  | 200 |  |  |  | 200 |  |  | 47 |  |  |  | 47 |  | 20 |  |  |  | 20 |  |
Dividends and dividend equivalents |  | (515) |  |  |  | (515) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  |  |  |  | (116) |  |  |  |  | (116) |  | (61) |  |  |  |  | (61) | (113) |  |  |  |  | (113) |
Distributions to member |  |  |  |  |  |  |  |  |  |  |  |  |  | (114) |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (129) |  |  |  |  | (129) |  |  |  |  |  |  | 3 |  |  |  |  |  |  | (1) |  |  |  |  |  | (1)
Adoption of stock-based compensation guidance cumulative effect adjustment |  | 7 |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period - shares at Jun. 30, 2016 |  |  | 677,549 | [1] |  |  |  |  |  | 66,368 | [2] |  |  |  |  |  | 21,294 | [3] |  |  |  |  | 37,818 | [4] |  |  |
Balance at end of period at Jun. 30, 2016 |  | $ 10,325 | $ 7 |  | 9,766 | 3,409 | (2,857) | $ 3,376 |  | $ 364 |  | 2,134 | 878 |  | $ 2,412 |  | $ 424 |  | 1,658 | 330 | $ 3,322 |  | $ 308 |  | 2,616 | 399 | (1)
Balance at end of period at Jun. 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,647 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period - shares at Dec. 31, 2016 |  | 679,731 | 679,731 | [1] |  |  |  | 66,368 |  | 66,368 | [2] |  |  |  | 21,294 |  | 21,294 | [3] |  |  | 37,818 |  | 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 | 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 | 685,473 | [1] |  |  |  | 66,368 |  | 66,368 | [2] |  |  |  | 21,294 |  | 21,294 | [3] |  |  | 37,818 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |
[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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