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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash Flows from Operating Activities |  |  |
Net Income |  | $ 452 | $ 403
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation |  | 269 | 242
Amortization |  | 21 | 23
Defined benefit plans - (income) expense |  | (50) | (19)
Deferred income taxes and investment tax credits |  | 59 | 161
Unrealized losses on derivatives, and other hedging activities |  | 85 | 35
Stock-based compensation expense |  | 15 | 19
Other |  | (3) | (1)
Change in current assets and current liabilities |  |  |
Accounts receivable |  | (71) | (43)
Accounts payable |  | (36) | (84)
Unbilled revenues |  | 58 | 52
Fuel, materials and supplies |  | 43 | 44
Prepayments |  | (73) | (110)
Taxes payable |  | 22 | (21)
Regulatory assets and liabilities, net |  | 64 | (17)
Other current liabilities |  | (120) | (60)
Other |  | 23 | 22
Other operating activities |  |  |
Defined benefit plans - funding |  | (150) | (520)
Other assets |  | (30) | 5
Other liabilities |  | (12) | 4
Net cash provided by operating activities |  | 566 | 135
Cash Flows from Investing Activities |  |  |
Expenditures for property, plant and equipment |  | (750) | (677)
Expenditures for intangible assets |  | (7) | (3)
Other investing activities |  | 4 | 1
Net cash used in investing activities |  | (753) | (679)
Cash Flows from Financing Activities |  |  |
Issuance of long-term debt |  | 144 | 64
Issuance of common stock |  | 100 | 73
Payment of common stock dividends |  | (273) | (258)
Net increase (decrease) in short-term debt |  | 369 | 744
Other financing activities |  | (9) | (16)
Net cash provided by (used in) financing activities |  | 331 | 607
Effect of Exchange Rate on Cash, Cash Equivalents and Restricted Cash |  | (2) | 3
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash |  | 142 | 66
Cash and Cash Equivalents at Beginning of Period |  | 485 |
Cash and Cash Equivalents at End of Period |  | 629 |
Cash, Cash Equivalents and Restricted Cash at Beginning of Period |  | 511 | 367
Cash, Cash Equivalents and Restricted Cash at End of Period |  | 653 | 433
Supplemental Disclosures of Cash Flow Information |  |  |
Accrued expenditures for property, plant and equipment at March 31, |  | 313 | 236
Accrued expenditures for intangible assets at March 31, |  | 65 | 62
PPL Electric Utilities Corp [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net Income | [1] | 148 | 79
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation |  | 85 | 75
Amortization |  | 6 | 8
Defined benefit plans - (income) expense |  | 2 | 5
Deferred income taxes and investment tax credits |  | 21 | 41
Other |  | (5) | 0
Change in current assets and current liabilities |  |  |
Accounts receivable |  | (30) | (27)
Accounts payable |  | (36) | (18)
Unbilled revenues |  | 16 | 12
Prepayments |  | (69) | (75)
Taxes payable |  | 4 | 0
Regulatory assets and liabilities, net |  | 5 | (11)
Other |  | (19) | (14)
Other operating activities |  |  |
Defined benefit plans - funding |  | (28) | (24)
Other assets |  | (25) | 5
Other liabilities |  | 1 | (1)
Net cash provided by operating activities |  | 76 | 55
Cash Flows from Investing Activities |  |  |
Expenditures for property, plant and equipment |  | (245) | (274)
Expenditures for intangible assets |  | (1) | (2)
Net cash used in investing activities |  | (246) | (276)
Cash Flows from Financing Activities |  |  |
Net increase (decrease) in short-term debt |  | 213 | 204
Contributions from parent |  | 0 | 100
Payment of common stock dividends to parent |  | (72) | (76)
Net cash provided by (used in) financing activities |  | 141 | 228
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash |  | (29) | 7
Cash and Cash Equivalents at Beginning of Period |  | 49 |
Cash and Cash Equivalents at End of Period |  | 20 |
Cash, Cash Equivalents and Restricted Cash at Beginning of Period |  | 51 | 15
Cash, Cash Equivalents and Restricted Cash at End of Period |  | 22 | 22
Supplemental Disclosures of Cash Flow Information |  |  |
Accrued expenditures for property, plant and equipment at March 31, |  | 147 | 122
LG And E And KU Energy LLC [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net Income | [2] | 142 | 103
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation |  | 117 | 105
Amortization |  | 5 | 7
Defined benefit plans - (income) expense |  | 3 | 8
Deferred income taxes and investment tax credits |  | 8 | 48
Change in current assets and current liabilities |  |  |
Accounts receivable |  | (5) | 21
Accounts payable |  | 10 | (28)
Accounts payable to affiliates |  | 2 | 7
Unbilled revenues |  | 31 | 22
Fuel, materials and supplies |  | 42 | 41
Taxes payable |  | 7 | (2)
Accrued interest |  | 42 | 42
Other |  | (7) | (38)
Other operating activities |  |  |
Defined benefit plans - funding |  | (108) | (22)
Expenditures for asset retirement obligations |  | (9) | (6)
Other assets |  | (3) | 1
Other liabilities |  | 1 | 3
Net cash provided by operating activities |  | 278 | 312
Cash Flows from Investing Activities |  |  |
Expenditures for property, plant and equipment |  | (294) | (184)
Net cash used in investing activities |  | (294) | (184)
Cash Flows from Financing Activities |  |  |
Net increase (decrease) in notes payable with affiliate |  | 12 | (81)
Issuance of long-term debt |  | 100 | 0
Distributions to member |  | (69) | (102)
Net increase (decrease) in short-term debt |  | (29) | 58
Other financing activities |  | (1) | (1)
Net cash provided by (used in) financing activities |  | 13 | (126)
Cash and Cash Equivalents, Period Increase (Decrease) |  | (3) | 2
Cash and Cash Equivalents at Beginning of Period |  | 30 | 13
Cash and Cash Equivalents at End of Period |  | 27 | 15
Supplemental Disclosures of Cash Flow Information |  |  |
Accrued expenditures for property, plant and equipment at March 31, |  | 124 | 75
Louisville Gas And Electric Co [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net Income | [1] | 72 | 54
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation |  | 48 | 44
Amortization |  | 4 | 3
Defined benefit plans - (income) expense |  | 1 | 2
Deferred income taxes and investment tax credits |  | 7 | 31
Change in current assets and current liabilities |  |  |
Accounts receivable |  | 2 | 13
Accounts receivable from affiliates |  | (7) | 1
Accounts payable |  | 8 | (12)
Accounts payable to affiliates |  | (2) | (4)
Unbilled revenues |  | 16 | 9
Fuel, materials and supplies |  | 36 | 33
Taxes payable |  | (1) | (28)
Accrued interest |  | 13 | 13
Other |  | 12 | (11)
Other operating activities |  |  |
Defined benefit plans - funding |  | (55) | (1)
Expenditures for asset retirement obligations |  | (5) | (4)
Other assets |  | 0 | 2
Other liabilities |  | (3) | (3)
Net cash provided by operating activities |  | 146 | 142
Cash Flows from Investing Activities |  |  |
Expenditures for property, plant and equipment |  | (150) | (94)
Net cash used in investing activities |  | (150) | (94)
Cash Flows from Financing Activities |  |  |
Issuance of long-term debt |  | 100 | 0
Net increase (decrease) in short-term debt |  | (62) | 38
Payment of common stock dividends to parent |  | (34) | (87)
Other financing activities |  | (1) | 0
Net cash provided by (used in) financing activities |  | 3 | (49)
Cash and Cash Equivalents, Period Increase (Decrease) |  | (1) | (1)
Cash and Cash Equivalents at Beginning of Period |  | 15 | 5
Cash and Cash Equivalents at End of Period |  | 14 | 4
Supplemental Disclosures of Cash Flow Information |  |  |
Accrued expenditures for property, plant and equipment at March 31, |  | 75 | 34
Kentucky Utilities Co [Member] |  |  |
Cash Flows from Operating Activities |  |  |
Net Income | [2] | 87 | 63
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation |  | 68 | 60
Amortization |  | 1 | 4
Defined benefit plans - (income) expense |  | 0 | 2
Deferred income taxes and investment tax credits |  | 1 | 37
Change in current assets and current liabilities |  |  |
Accounts receivable |  | (7) | 8
Accounts payable |  | 11 | (4)
Accounts payable to affiliates |  | 0 | (7)
Unbilled revenues |  | 15 | 13
Fuel, materials and supplies |  | 6 | 8
Taxes payable |  | 14 | (34)
Accrued interest |  | 22 | 22
Other |  | 17 | (12)
Other operating activities |  |  |
Defined benefit plans - funding |  | (47) | (19)
Expenditures for asset retirement obligations |  | (4) | (2)
Other assets |  | (3) | (1)
Other liabilities |  | 4 | 1
Net cash provided by operating activities |  | 185 | 139
Cash Flows from Investing Activities |  |  |
Expenditures for property, plant and equipment |  | (143) | (89)
Net cash used in investing activities |  | (143) | (89)
Cash Flows from Financing Activities |  |  |
Net increase (decrease) in short-term debt |  | 33 | 20
Payment of common stock dividends to parent |  | (79) | (70)
Net cash provided by (used in) financing activities |  | (46) | (50)
Cash and Cash Equivalents, Period Increase (Decrease) |  | (4) | 0
Cash and Cash Equivalents at Beginning of Period |  | 15 | 7
Cash and Cash Equivalents at End of Period |  | 11 | 7
Supplemental Disclosures of Cash Flow Information |  |  |
Accrued expenditures for property, plant and equipment at March 31, |  | $ 48 | $ 41
[1] | Net income equals comprehensive income.
[2] | Net income approximates comprehensive income.

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- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of increase (decrease) in current liabilities classified as other. + References No definition available. + Details
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- Definition Amount of increase (decrease) in operating assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of increase (decrease) in operating liabilities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 + Details
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- Definition The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of noncash expense (reversal of expense) for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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