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Retirement and Postemployment Benefits (Weighted-Average Assumptions, Cost Trend Rates and Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | $ 464 | $ 535 |
Pension Plan [Member] | U.S. [Member] |  |  |
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract] |  |  |
Benefit obligations valuation discount rate | 3.64% | 4.35% |
Benefit obligations valuation rate of compensation increase | 3.79% | 3.79% |
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract] |  |  |
Net periodic benefit costs discount rate - service cost | 4.35% | 3.70% | 4.21%
Net periodic benefit costs discount rate - interest cost | 4.35% | 3.70% | 4.21%
Net periodic benefit costs rate of compensation increase | 3.79% | 3.78% | 3.95%
Net periodic benefit costs expected return on plan assets | 7.25% | 7.25% | 7.00%
Assumed Health Care Cost Trend Rates (Details) [Abstract] |  |  |
Health care cost trend rate assumed for next year, obligations | 6.60% | 6.60% | 6.60%
Health care cost trend rate assumed for next year, cost | 6.60% | 6.60% | 7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), obligations | 5.00% | 5.00% | 5.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), cost | 5.00% | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate, obligations | 2024 | 2023 | 2022
Year that the rate reaches the ultimate trend rate, cost | 2023 | 2022 | 2022
Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of period | $ 3,883 | $ 4,288 |
Service cost | 50 | 62 | $ 65
Interest cost | 164 | 156 | 168
Participant contributions | 0 | 0 |
Plan Amendments | 2 | 1 |
Actuarial (gain) loss | 368 | (352) |
Settlements | (21) | 0 |
Gross benefits paid | (300) | (272) |
Federal subsidy | 0 | 0 |
Currency conversion | 0 | 0 |
Benefit Obligation, end of period | 4,146 | 3,883 | 4,288
Change in Plan Assets [Roll Forward] |  |  |
Balance at beginning of period | 3,109 | 3,488 |
Actual return on plan assets | 735 | (260) |
Employer contributions | 63 | 153 |
Participant contributions | 0 | 0 |
Transfer out | 0 | 0 |
Settlements | (22) | 0 |
Gross benefits paid | (300) | (272) |
Currency conversion | 0 | 0 |
Balance at end of period | 3,585 | 3,109 | $ 3,488
Funded Status, end of period | (561) | (774) |
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | 24 | 0 |
Current liability | (8) | (13) |
Noncurrent liability | (577) | (761) |
Net amount recognized, end of period | (561) | (774) |
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract] |  |  |
Prior service cost (credit) | 34 | 40 |
Net actuarial (gain) loss | 1,029 | 1,207 |
Total | 1,063 | 1,247 |
Total accumulated benefit obligation for defined benefit pension plans | 3,910 | 3,668 |
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract] |  |  |
AOCI | 352 | 370 |
Regulatory assets/liabilities | 711 | 877 |
Total | 1,063 | 1,247 |
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract] |  |  |
Projected benefit obligations | 3,861 | 3,883 |
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets | 3,275 | 3,109 |
Accumulated benefit obligation | 3,624 | 3,668 |
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets | $ 3,275 | $ 3,109 |
Pension Plan [Member] | U.K. [Member] |  |  |
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract] |  |  |
Benefit obligations valuation discount rate | 1.94% | 2.98% |
Benefit obligations valuation rate of compensation increase | 3.25% | 3.50% |
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract] |  |  |
Net periodic benefit costs discount rate - service cost | 3.12% | 2.73% | 2.99%
Net periodic benefit costs discount rate - interest cost | 2.62% | 2.31% | 2.41%
Net periodic benefit costs rate of compensation increase | 3.50% | 3.50% | 3.50%
Net periodic benefit costs expected return on plan assets | 7.21% | 7.23% | 7.22%
Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of period | $ 7,275 | $ 8,219 |
Service cost | 68 | 82 | $ 76
Interest cost | 187 | 185 | 178
Participant contributions | 12 | 13 |
Plan Amendments | 0 | 12 |
Actuarial (gain) loss | 1,220 | (406) |
Settlements | 0 | 0 |
Gross benefits paid | (363) | (381) |
Federal subsidy | 0 | 0 |
Currency conversion | 116 | (449) |
Benefit Obligation, end of period | 8,515 | 7,275 | 8,219
Change in Plan Assets [Roll Forward] |  |  |
Balance at beginning of period | 7,801 | 8,490 |
Actual return on plan assets | 1,095 | (30) |
Employer contributions | 278 | 188 |
Participant contributions | 12 | 13 |
Transfer out | 0 | 0 |
Settlements | 0 | 0 |
Gross benefits paid | (363) | (381) |
Currency conversion | 122 | (479) |
Balance at end of period | 8,945 | 7,801 | $ 8,490
Funded Status, end of period | 430 | 526 |
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | 440 | 535 |
Current liability | (1) | (1) |
Noncurrent liability | (9) | (8) |
Net amount recognized, end of period | 430 | 526 |
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract] |  |  |
Prior service cost (credit) | 11 | 12 |
Net actuarial (gain) loss | 3,435 | 2,806 |
Total | 3,446 | 2,818 |
Total accumulated benefit obligation for defined benefit pension plans | 7,821 | 6,689 |
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract] |  |  |
Total | 3,446 | 2,818 |
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract] |  |  |
Projected benefit obligations | 10 | 9 |
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets | 0 | 0 |
Accumulated benefit obligation | 10 | 9 |
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets | $ 0 | $ 0 |
Other Postretirement Benefits Plan [Member] |  |  |
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract] |  |  |
Benefit obligations valuation discount rate | 3.60% | 4.31% |
Benefit obligations valuation rate of compensation increase | 3.76% | 3.76% |
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract] |  |  |
Net periodic benefit costs discount rate - service cost | 4.31% | 3.64% | 4.11%
Net periodic benefit costs discount rate - interest cost | 4.31% | 3.64% | 4.11%
Net periodic benefit costs rate of compensation increase | 3.76% | 3.75% | 3.92%
Net periodic benefit costs expected return on plan assets | 6.46% | 6.40% | 6.21%
Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of period | $ 538 | $ 589 |
Service cost | 6 | 7 | $ 7
Interest cost | 22 | 21 | 23
Participant contributions | 14 | 13 |
Plan Amendments | 0 | 0 |
Actuarial (gain) loss | 34 | (34) |
Settlements | 0 | 0 |
Gross benefits paid | (58) | (58) |
Federal subsidy | 1 | 0 |
Currency conversion | 0 | 0 |
Benefit Obligation, end of period | 557 | 538 | 589
Change in Plan Assets [Roll Forward] |  |  |
Balance at beginning of period | 301 | 405 |
Actual return on plan assets | 71 | (20) |
Employer contributions | 10 | 23 |
Participant contributions | 10 | 11 |
Transfer out | 0 | (65) |
Settlements | 0 | 0 |
Gross benefits paid | (52) | (53) |
Currency conversion | 0 | 0 |
Balance at end of period | 340 | 301 | $ 405
Funded Status, end of period | (217) | (237) |
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | 11 | 2 |
Current liability | (2) | (3) |
Noncurrent liability | (226) | (236) |
Net amount recognized, end of period | (217) | (237) |
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract] |  |  |
Prior service cost (credit) | 10 | 10 |
Net actuarial (gain) loss | 6 | 24 |
Total | 16 | 34 |
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract] |  |  |
AOCI | 13 | 21 |
Regulatory assets/liabilities | 3 | 13 |
Total | 16 | 34 |
PPL Electric Utilities Corp [Member] | Pension Plan [Member] | U.S. [Member] | PPL Services Funded Status Allocation [Member] |  |  |
Change in Plan Assets [Roll Forward] |  |  |
Funded Status, end of period | 179 | 285 |
PPL Electric Utilities Corp [Member] | Other Postretirement Benefits Plan [Member] | PPL Services Funded Status Allocation [Member] |  |  |
Change in Plan Assets [Roll Forward] |  |  |
Funded Status, end of period | $ 122 | $ 120 |
LG And E And KU Energy LLC [Member] | Pension Plan [Member] | U.S. [Member] |  |  |
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract] |  |  |
Benefit obligations valuation discount rate | 3.62% | 4.35% |
Benefit obligations valuation rate of compensation increase | 3.50% | 3.50% |
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract] |  |  |
Net periodic benefit costs discount rate | 4.35% | 3.69% | 4.19%
Net periodic benefit costs rate of compensation increase | 3.50% | 3.50% | 3.50%
Net periodic benefit costs expected return on plan assets | 7.25% | 7.25% | 7.00%
Assumed Health Care Cost Trend Rates (Details) [Abstract] |  |  |
Health care cost trend rate assumed for next year, obligations | 6.60% | 6.60% | 6.60%
Health care cost trend rate assumed for next year, cost | 6.60% | 6.60% | 7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), obligations | 5.00% | 5.00% | 5.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), cost | 5.00% | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate, obligations | 2024 | 2023 | 2022
Year that the rate reaches the ultimate trend rate, cost | 2023 | 2022 | 2022
Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of period | $ 1,580 | $ 1,771 |
Service cost | 22 | 25 | $ 24
Interest cost | 66 | 63 | 68
Participant contributions | 0 | 0 |
Plan Amendments | 2 | 0 |
Actuarial (gain) loss | 166 | (168) |
Settlements | (16) | 0 |
Gross benefits paid | (136) | (111) |
Benefit Obligation, end of period | 1,684 | 1,580 | 1,771
Defined Benefit Plan One Time Cash Payouts To Terminated Vested Employees | 74 | 52 |
Change in Plan Assets [Roll Forward] |  |  |
Balance at beginning of period | 1,294 | 1,402 |
Actual return on plan assets | 304 | (106) |
Employer contributions | 24 | 109 |
Participant contributions | 0 | 0 |
Settlements | (16) | 0 |
Gross benefits paid | (136) | (111) |
Balance at end of period | 1,470 | 1,294 | $ 1,402
Funded Status, end of period | (214) | (286) |
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | 24 | 0 |
Current liability | (5) | (4) |
Noncurrent liability | (233) | (282) |
Net amount recognized, end of period | (214) | (286) |
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract] |  |  |
Prior service cost (credit) | 30 | 35 |
Net actuarial (gain) loss | 380 | 439 |
Total | 410 | 474 |
Total accumulated benefit obligation for defined benefit pension plans | 1,561 | 1,467 |
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract] |  |  |
AOCI | 132 | 118 |
Regulatory assets/liabilities | 278 | 356 |
Total | 410 | 474 |
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract] |  |  |
Projected benefit obligations | 1,398 | 1,580 |
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets | 1,160 | 1,294 |
Accumulated benefit obligation | 1,276 | 1,467 |
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets | $ 1,160 | $ 1,294 |
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract] |  |  |
Benefit obligations valuation discount rate | 3.59% | 4.32% |
Benefit obligations valuation rate of compensation increase | 3.50% | 3.50% |
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract] |  |  |
Net periodic benefit costs discount rate | 4.32% | 3.65% | 4.12%
Net periodic benefit costs rate of compensation increase | 3.50% | 3.50% | 3.50%
Net periodic benefit costs expected return on plan assets | 7.00% | 7.15% | 6.82%
Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of period | $ 205 | $ 223 |
Service cost | 4 | 4 | $ 4
Interest cost | 8 | 8 | 9
Participant contributions | 7 | 8 |
Plan Amendments | 0 | 0 |
Actuarial (gain) loss | 5 | (16) |
Settlements | 0 | 0 |
Gross benefits paid | (21) | (22) |
Benefit Obligation, end of period | 208 | 205 | 223
Change in Plan Assets [Roll Forward] |  |  |
Balance at beginning of period | 117 | 116 |
Actual return on plan assets | 27 | (9) |
Employer contributions | 11 | 24 |
Participant contributions | 7 | 8 |
Settlements | 0 | 0 |
Gross benefits paid | (21) | (22) |
Balance at end of period | 141 | 117 | $ 116
Funded Status, end of period | (67) | (88) |
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | 11 | 2 |
Current liability | (2) | (3) |
Noncurrent liability | (76) | (87) |
Net amount recognized, end of period | (67) | (88) |
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract] |  |  |
Prior service cost (credit) | 10 | 12 |
Net actuarial (gain) loss | (37) | (25) |
Total | (27) | (13) |
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract] |  |  |
AOCI | 4 | 10 |
Regulatory assets/liabilities | (31) | (23) |
Total | $ (27) | $ (13) |
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member] |  |  |
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract] |  |  |
Benefit obligations valuation discount rate | 3.60% | 4.33% |
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract] |  |  |
Net periodic benefit costs discount rate | 4.33% | 3.65% | 4.13%
Net periodic benefit costs expected return on plan assets | 7.25% | 7.25% | 7.00%
Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of period | $ 285 | $ 326 |
Service cost | 1 | 1 | $ 1
Interest cost | 11 | 12 | 13
Actuarial (gain) loss | 25 | (24) |
Gross benefits paid | (36) | (30) |
Benefit Obligation, end of period | 286 | 285 | 326
Defined Benefit Plan One Time Cash Payouts To Terminated Vested Employees | 21 | 16 |
Change in Plan Assets [Roll Forward] |  |  |
Balance at beginning of period | 281 | 325 |
Actual return on plan assets | 64 | (24) |
Employer contributions | 1 | 10 |
Gross benefits paid | (36) | (30) |
Balance at end of period | 310 | 281 | $ 325
Funded Status, end of period | 24 | (4) |
Amounts recognized in the Balance Sheets consist of: [Abstract] |  |  |
Noncurrent asset | 24 |  |
Noncurrent liability |  | (4) |
Net amount recognized, end of period | 24 | (4) |
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract] |  |  |
Prior service cost (credit) | 17 | 22 |
Net actuarial (gain) loss | 79 | 107 |
Total | 96 | 129 |
Total accumulated benefit obligation for defined benefit pension plans | 286 | 285 |
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract] |  |  |
Total | 96 | 129 |
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member] | LKE Funded Status Allocation [Member] |  |  |
Change in Plan Assets [Roll Forward] |  |  |
Funded Status, end of period | (7) | 7 |
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits Plan [Member] | LKE Funded Status Allocation [Member] |  |  |
Change in Plan Assets [Roll Forward] |  |  |
Funded Status, end of period | 63 | 65 |
Kentucky Utilities Co [Member] | Pension Plan [Member] | U.S. [Member] | LKE Funded Status Allocation [Member] |  |  |
Change in Plan Assets [Roll Forward] |  |  |
Funded Status, end of period | (31) | 1 |
Kentucky Utilities Co [Member] | Other Postretirement Benefits Plan [Member] | LKE Funded Status Allocation [Member] |  |  |
Change in Plan Assets [Roll Forward] |  |  |
Funded Status, end of period | $ 16 | $ 25 |

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- Definition The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income and regulatory assets or liabilities associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income and regulatory assets or liabilities as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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- Definition Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. This represents amounts in other comprehensive income and regulatory assets or liabilities. + References No definition available. + Details
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- Definition For the change in plan assets, the amount of increase related to actual expenses paid offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. This element represents the amount of actual expenses paid causing a decrease (increase) in the fair value of plan assets. + References No definition available. + Details
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- Definition The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in regulatory assets or liabilities associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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