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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 1,926 | $ 1,845 | $ 1,725 | $ 1,951 | $ 1,832 | $ 1,889 | $ 1,785 | $ 2,011 | $ 7,447 | $ 7,517 | $ 7,669
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other operation and maintenance |  |  |  |  |  |  |  |  | 1,635 | 1,745 | 1,938
Total Operating Expenses |  |  |  |  |  |  |  |  | 4,379 | 4,469 | 4,838
Operating Loss | 793 | 777 | 702 | 796 | 714 | 786 | 725 | 823 | 3,068 | 3,048 | 2,831
Other Income (Expense) - net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) - net |  |  |  |  |  |  |  |  | (255) | 390 | 108
Interest Expense |  |  |  |  |  |  |  |  | 901 | 888 | 871
Income Taxes |  |  |  |  |  |  |  |  | 784 | 648 | 465
Net income | $ 78 | $ 355 | $ 292 | $ 403 | $ 465 | $ 473 | $ 483 | $ 481 | 1,128 | 1,902 | 682
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | 356 | (1,050) | (430)
Comprehensive Income Attributable to PPL Shareowners |  |  |  |  |  |  |  |  | $ 1,484 | $ 852 | $ 252
Net Income Available to PPL Corporation Common Shareowners: (in dollars per share) |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.11 | $ 0.52 | $ 0.43 | $ 0.59 | $ 0.68 | $ 0.70 | $ 0.71 | $ 0.71 | $ 1.64 | $ 2.80 | $ 1.01
Diluted | $ 0.11 | $ 0.51 | $ 0.43 | $ 0.59 | $ 0.68 | $ 0.69 | $ 0.71 | $ 0.71 | $ 1.64 | $ 2.79 | $ 1.01
Weighted-Average Shares of Common Stock Outstanding (in thousands) |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | 685,240 | 677,592 | 669,814
Diluted |  |  |  |  |  |  |  |  | 687,334 | 680,446 | 672,586
PPL Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other operation and maintenance |  |  |  |  |  |  |  |  | 2 | 2 | 9
Total Operating Expenses |  |  |  |  |  |  |  |  | 2 | 2 | 9
Operating Loss |  |  |  |  |  |  |  |  | (2) | (2) | (9)
Other Income (Expense) - net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 1,175 | 1,915 | 711
Other income (expense) |  |  |  |  |  |  |  |  | (1) | (1) | (15)
Other Income (Expense) - net |  |  |  |  |  |  |  |  | 1,174 | 1,914 | 696
Interest Expense |  |  |  |  |  |  |  |  | 8 | 8 | 9
Interest Expense with Affiliates |  |  |  |  |  |  |  |  | 16 | 10 | 10
Income Before Income Taxes |  |  |  |  |  |  |  |  | 1,148 | 1,894 | 668
Income Taxes |  |  |  |  |  |  |  |  | 20 | (8) | (14)
Net income |  |  |  |  |  |  |  |  | 1,128 | 1,902 | 682
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | 356 | (1,050) | (430)
Comprehensive Income Attributable to PPL Shareowners |  |  |  |  |  |  |  |  | $ 1,484 | $ 852 | $ 252
Net Income Available to PPL Corporation Common Shareowners: (in dollars per share) |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | $ 1.64 | $ 2.80 | $ 1.01
Diluted |  |  |  |  |  |  |  |  | $ 1.64 | $ 2.79 | $ 1.01
Weighted-Average Shares of Common Stock Outstanding (in thousands) |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | 685,240 | 677,592 | 669,814
Diluted |  |  |  |  |  |  |  |  | 687,334 | 680,446 | 672,586
L G And E And K U Energy L L C Unconsolidated [Member] |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) - net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | $ 397 | $ 452 | $ 390
Interest Income from Affiliate |  |  |  |  |  |  |  |  | 14 | 9 | 4
Other Income (Expense) - net |  |  |  |  |  |  |  |  | 411 | 461 | 394
Interest Expense |  |  |  |  |  |  |  |  | 30 | 29 | 39
Interest Expense with Affiliates |  |  |  |  |  |  |  |  | 20 | 18 | 5
Income Before Income Taxes |  |  |  |  |  |  |  |  | 361 | 414 | 350
Income Taxes |  |  |  |  |  |  |  |  | 45 | (15) | (14)
Net income |  |  |  |  |  |  |  |  | 316 | 429 | 364
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | (18) | (24) | (1)
Comprehensive Income Attributable to PPL Shareowners |  |  |  |  |  |  |  |  | $ 298 | $ 405 | $ 363

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