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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flow Hedges [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) reclassified from AOCI into income on derivative (effective portion) | $ 35 | $ (91) | $ 112
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Cash Flow Hedges [Member] | Other Comprehensive Income [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in OCI on derivative (effective portion) | 45 | (98) | 109
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Comprehensive Income [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in OCI on derivative (effective portion) | 4 | 0 | (21)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) reclassified from AOCI into income on derivative (effective portion) | (8) | (9) | (7)
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Comprehensive Income [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in OCI on derivative (effective portion) | 41 | (98) | 130
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Income (Expense) Net [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) reclassified from AOCI into income on derivative (effective portion) | 42 | (82) | 116
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 | 0 | 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) reclassified from AOCI into income on derivative (effective portion) | 1 |  | 3
Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing) | 0 |  | 0
Net Investment Hedges [Member] | Foreign Currency Contracts [Member] | Other Comprehensive Income [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in OCI on derivative (effective portion) | 11 | 1 | 2
Derivatives Not Designated As Hedging Instruments [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | 145 | (267) | 377
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | 6 | 5 | 7
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (5) | (6) | (7)
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Other Income (Expense) Net [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | 150 | (261) | 384
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | 6 | 5 | 7
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | (5) | (6) | (7)
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized as regulatory liabilities/assets | 6 | 5 | 7
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member] |  |  |
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract] |  |  |
Gain (loss) recognized in income on derivative | $ (5) | $ (6) | $ (7)

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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