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SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 1,954 | $ 1,933 | $ 1,803 | $ 2,079 | $ 1,939 | $ 1,872 | $ 1,848 | $ 2,126 | $ 7,769 | $ 7,785 | $ 7,447
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other operation and maintenance |  |  |  |  |  |  |  |  | 1,985 | 1,983 | 1,802
Total Operating Expenses |  |  |  |  |  |  |  |  | 4,929 | 4,933 | 4,546
Operating Loss | 693 | 726 | 640 | 781 | 657 | 686 | 658 | 851 | 2,840 | 2,852 | 2,901
Other Income (Expense) - net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) - net |  |  |  |  |  |  |  |  | 309 | 396 | (88)
Interest Expense |  |  |  |  |  |  |  |  | 994 | 963 | 901
Income Before Income Taxes |  |  |  |  |  |  |  |  | 2,155 | 2,285 | 1,912
Income Taxes |  |  |  |  |  |  |  |  | 409 | 458 | 784
Net income | $ 364 | $ 475 | $ 441 | $ 466 | $ 415 | $ 445 | $ 515 | $ 452 | 1,746 | 1,827 | 1,128
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | (394) | (491) | 356
Comprehensive Income Attributable to PPL Shareowners |  |  |  |  |  |  |  |  | $ 1,352 | $ 1,336 | $ 1,484
Net Income Available to PPL Corporation Common Shareowners: (in dollars per share) |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.49 | $ 0.66 | $ 0.61 | $ 0.65 | $ 0.57 | $ 0.63 | $ 0.74 | $ 0.65 | $ 2.39 | $ 2.59 | $ 1.64
Diluted (in dollars per share) | $ 0.48 | $ 0.65 | $ 0.60 | $ 0.64 | $ 0.57 | $ 0.62 | $ 0.73 | $ 0.65 | $ 2.37 | $ 2.58 | $ 1.64
Weighted-Average Shares of Common Stock Outstanding (in thousands) |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | 728,512 | 704,439 | 685,240
Diluted |  |  |  |  |  |  |  |  | 736,754 | 708,619 | 687,334
LG&E and KU Energy LLC Unconsolidated [Member] |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) - net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | $ 477 | $ 470 | $ 397
Interest Income from Affiliate |  |  |  |  |  |  |  |  | 28 | 25 | 14
Other Income (Expense) - net |  |  |  |  |  |  |  |  | 505 | 495 | 411
Interest Expense |  |  |  |  |  |  |  |  | 30 | 29 | 30
Interest Expense with Affiliates |  |  |  |  |  |  |  |  | 32 | 28 | 20
Income Before Income Taxes |  |  |  |  |  |  |  |  | 443 | 438 | 361
Income Taxes |  |  |  |  |  |  |  |  | (25) | (7) | 45
Net income |  |  |  |  |  |  |  |  | 468 | 445 | 316
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | (4) | 17 | (18)
Comprehensive Income Attributable to PPL Shareowners |  |  |  |  |  |  |  |  | $ 464 | $ 462 | $ 298

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