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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The assets and liabilities measured at fair value were:
| March 31, 2018 |  | December 31, 2017
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 629 |  |  | $ | 629 |  |  | $ | — |  |  | $ | — |  |  | $ | 485 |  |  | $ | 485 |  |  | $ | — |  |  | $ | — |
Restricted cash and cash equivalents (a) | 24 |  |  | 24 |  |  | — |  |  | — |  |  | 26 |  |  | 26 |  |  | — |  |  | — |
Price risk management assets (b): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | 97 |  |  | — |  |  | 97 |  |  | — |  |  | 163 |  |  | — |  |  | 163 |  |  | — |
Cross-currency swaps | 79 |  |  | — |  |  | 79 |  |  | — |  |  | 101 |  |  | — |  |  | 101 |  |  | — |
Total price risk management assets | 176 |  |  | — |  |  | 176 |  |  | — |  |  | 264 |  |  | — |  |  | 264 |  |  | — |
Total assets | $ | 829 |  |  | $ | 653 |  |  | $ | 176 |  |  | $ | — |  |  | $ | 775 |  |  | $ | 511 |  |  | $ | 264 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price risk management liabilities (b): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 22 |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |
Foreign currency contracts | 167 |  |  | — |  |  | 167 |  |  | — |  |  | 148 |  |  | — |  |  | 148 |  |  | — |
Total price risk management liabilities | $ | 189 |  |  | $ | — |  |  | $ | 189 |  |  | $ | — |  |  | $ | 174 |  |  | $ | — |  |  | $ | 174 |  |  | $ | — |
PPL Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 49 |  |  | $ | 49 |  |  | $ | — |  |  | $ | — |
Restricted cash and cash equivalents (a) | 2 |  |  | 2 |  |  | — |  |  | — |  |  | 2 |  |  | 2 |  |  | — |  |  | — |
Total assets | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 51 |  |  | $ | 51 |  |  | $ | — |  |  | $ | — |
LKE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 27 |  |  | $ | 27 |  |  | $ | — |  |  | $ | — |  |  | $ | 30 |  |  | $ | 30 |  |  | $ | — |  |  | $ | — |
Total assets | $ | 27 |  |  | $ | 27 |  |  | $ | — |  |  | $ | — |  |  | $ | 30 |  |  | $ | 30 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price risk management liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 22 |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |
Total price risk management liabilities | $ | 22 |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |
LG&E |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 14 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |
Total assets | $ | 14 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price risk management liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | 22 |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |
Total price risk management liabilities | $ | 22 |  |  | $ | — |  |  | $ | 22 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |  |  | $ | 26 |  |  | $ | — |
| March 31, 2018 |  | December 31, 2017
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
KU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |
Total assets | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |
(a) | Current portion is included in "Other current assets" and long-term portion is included in "Other noncurrent assets" on the Balance Sheets.
(b) | Current portion is included in "Price risk management assets" and "Other current liabilities" and noncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
Fair Value, by Balance Sheet Grouping | The carrying amounts of long-term debt on the Balance Sheets and their estimated fair values are set forth below.
| March 31, 2018 |  | December 31, 2017
| Carrying Amount (a) |  | Fair Value |  | Carrying Amount (a) |  | Fair Value
PPL | $ | 20,464 |  |  | $ | 23,577 |  |  | $ | 20,195 |  |  | $ | 23,783 |
PPL Electric | 3,298 |  |  | 3,632 |  |  | 3,298 |  |  | 3,769 |
LKE | 5,259 |  |  | 5,654 |  |  | 5,159 |  |  | 5,670 |
LG&E | 1,808 |  |  | 1,925 |  |  | 1,709 |  |  | 1,865 |
KU | 2,329 |  |  | 2,546 |  |  | 2,328 |  |  | 2,605 |
(a) | Amounts are net of debt issuance costs.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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