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Retirement and Postemployment Benefits (Plan Assets and Expected Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pension Plan [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | $ 2,936 | $ 3,176
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,176 | 3,149
Balance at end of period | 2,936 | 3,176
Defined Benefit Plan Estimated Future Employer Contributions (Numeric) [Abstract] |  |
Employer contributions | 10 | $ 13
Expected amount of benefit payments in the next period for non-qualified plans | 10 |
Estimated Future Benefit Payments (Details) [Abstract] |  |
2022 | 304 |
2023 | 297 |
2024 | 288 |
2025 | 282 |
2026 | 276 |
2027-2030 | $ 1,298 |
Pension Plan [Member] | Master Trust [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 100.00% | 100.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 100.00% |
Assumptions Used in Calculations (Numeric) [Abstract] |  |
The limited lives of four partnership of private equity investments (in years) | 10 years |
The amount of potential liability that maybe required to be funded by the master trust during life of the partnership | $ 59 |
Number Of Days Notice Required To Redeem Shares | 45 days |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | $ 2,936 | $ 3,175
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,175 |
Balance at end of period | $ 2,936 | $ 3,175
Pension Plan [Member] | Master Trust [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 100.00% | 100.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 100.00% |
Assumptions Used in Calculations (Numeric) [Abstract] |  |
The limited lives of four partnership of private equity investments (in years) | 10 years |
The amount of potential liability that maybe required to be funded by the master trust during life of the partnership | $ 59 |
Number Of Days Notice Required To Redeem Shares | 45 days |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | $ 2,936 | $ 3,175
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,175 |
Balance at end of period | 2,936 | 3,175
Pension Plan [Member] | Master Trust [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 424 | 421
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 421 |
Balance at end of period | 424 | 421
Pension Plan [Member] | Master Trust [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 424 | 421
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 421 |
Balance at end of period | 424 | 421
Pension Plan [Member] | Master Trust [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 824 | 1,012
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 1,012 |
Balance at end of period | 824 | 1,012
Pension Plan [Member] | Master Trust [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 824 | 1,012
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 1,012 |
Balance at end of period | 824 | 1,012
Pension Plan [Member] | Master Trust [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 19 | 10
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 10 |
Balance at end of period | 19 | 10
Pension Plan [Member] | Master Trust [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 19 | 10
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 10 |
Balance at end of period | 19 | 10
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 212 | 226
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 212 | 226
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 212 | 226
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 212 | 226
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Cash And Cash Equivalents [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 461 | 542
Measured at fair value not using net asset value per share | 63 | 36
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 461 | 542
Measured at fair value not using net asset value per share | 63 | 36
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 63 | 36
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 63 | 36
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Equity Securities [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | International Equity Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 376 | 431
Pension Plan [Member] | Master Trust [Member] | International Equity Securities [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 376 | 431
Pension Plan [Member] | Master Trust [Member] | Commingled Debt Equity Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 461 | 528
Pension Plan [Member] | Master Trust [Member] | Commingled Debt Equity Securities [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 461 | 528
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 150 | 159
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 150 | 159
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 149 | 159
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 149 | 159
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 1 | 0
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 1 | 0
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | US Treasury And US Government Sponsored Agency Debt Securities [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 867 | 915
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 867 | 915
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 848 | 906
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 848 | 906
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 19 | 9
Fair value at end of period | 19 | 10
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 10 | 16
Purchases, sales and settlements | 4 | (8)
Balance at end of period | 19 | 10
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 3 [Member] | U.S. [Member] |  |
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Actual return on plan assets relating to assets still held at the reporting date |  | (2)
Actual return on plan assets relating to assets sold during the period |  | 4
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 19 | 9
Fair value at end of period | 19 | 10
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 10 | 16
Purchases, sales and settlements | 4 | (8)
Balance at end of period | 19 | 10
Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 3 [Member] | LGE [Member] |  |
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Actual return on plan assets relating to assets still held at the reporting date | (2) |
Actual return on plan assets relating to assets sold during the period | 7 |
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 13 | 14
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 13 | 14
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 13 | 13
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 13 | 13
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 1
Pension Plan [Member] | Master Trust [Member] | Other Debt Securities [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 1
Pension Plan [Member] | Master Trust [Member] | Real Estate Alternative Investments [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 72 | 61
Pension Plan [Member] | Master Trust [Member] | Real Estate Alternative Investments [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 72 | 61
Pension Plan [Member] | Master Trust [Member] | Total Trust Assets Prior to Adjustments [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 2,948 | 3,315
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,315 |
Balance at end of period | 2,948 | 3,315
Pension Plan [Member] | Master Trust [Member] | Total Trust Assets Prior to Adjustments [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 2,948 | 3,315
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,315 |
Balance at end of period | 2,948 | 3,315
Pension Plan [Member] | Master Trust [Member] | Private Equity Alternative Investments [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 114 | 105
Pension Plan [Member] | Master Trust [Member] | Private Equity Alternative Investments [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 114 | 105
Pension Plan [Member] | Master Trust [Member] | Hedge Fund Of Funds Alternative Investments [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 181 | 192
Pension Plan [Member] | Master Trust [Member] | Hedge Fund Of Funds Alternative Investments [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 181 | 192
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | (38) | 93
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | (38) | 93
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | Level 1 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | (38) | 93
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | Level 2 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | (38) | 93
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Derivatives [Member] | Level 3 [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Pension Plan [Member] | Master Trust [Member] | Receivables And Payables Net [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 102 | (16)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (16) |
Balance at end of period | 102 | (16)
Pension Plan [Member] | Master Trust [Member] | Receivables And Payables Net [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 102 | (16)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (16) |
Balance at end of period | 102 | (16)
Pension Plan [Member] | Master Trust [Member] | Account 401 H [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | (114) | (124)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (124) |
Balance at end of period | (114) | (124)
Pension Plan [Member] | Master Trust [Member] | Account 401 H [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | (114) | (124)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (124) |
Balance at end of period | (114) | (124)
Pension Plan [Member] | Master Trust [Member] | Private credit partnership [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 16 | 13
Pension Plan [Member] | Master Trust [Member] | Private credit partnership [Member] | LKE [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | $ 16 | $ 13
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 55.00% | 54.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 55.00% |
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 55.00% | 54.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 55.00% |
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Equity Securities [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 30.00% | 31.00%
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Equity Securities [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 30.00% | 31.00%
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Debt Securities [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 13.00% | 12.00%
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Debt Securities [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 13.00% | 12.00%
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Alternative Investments [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 12.00% | 11.00%
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Alternative Investments [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 12.00% | 11.00%
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 43.00% | 43.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 43.00% |
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 43.00% | 43.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 43.00% |
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Debt Securities [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 35.00% | 36.00%
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Debt Securities [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 35.00% | 36.00%
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Derivatives [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 8.00% | 7.00%
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Derivatives [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 8.00% | 7.00%
Pension Plan [Member] | Master Trust [Member] | Liquidity Portfolio [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 2.00% | 3.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 2.00% |
Pension Plan [Member] | Master Trust [Member] | Liquidity Portfolio [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 2.00% | 3.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 2.00% |
Other Postretirement Benefits Plan [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 100.00% | 100.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 100.00% |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | $ 417 | $ 438
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 438 | 417
Balance at end of period | 417 | 438
Defined Benefit Plan Estimated Future Employer Contributions (Numeric) [Abstract] |  |
Employer contributions | 14 | 16
Amount to be contributed to plan in the next fiscal year | 13 |
Estimated Future Benefit Payments (Details) [Abstract] |  |
2022 | 50 |
2023 | 49 |
2024 | 49 |
2025 | 48 |
2026 | 47 |
2027-2030 | 218 |
Expected Federal Subsidy (Details) [Abstract] |  |
Federal subsidy 2022 | 0 |
Federal subsidy 2023 | 0 |
Federal subsidy 2024 | 0 |
Federal subsidy 2025 | 0 |
Federal subsidy 2026 | 0 |
Federal subsidy 2027-2030 | 0 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 163 | 166
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 166 |
Balance at end of period | 163 | 166
Other Postretirement Benefits Plan [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 0 | 0
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
Other Postretirement Benefits Plan [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 0 | 0
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 0 |
Balance at end of period | $ 0 | $ 0
Other Postretirement Benefits Plan [Member] | Cash And Cash Equivalents [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 6.00% | 6.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 6.00% |
Other Postretirement Benefits Plan [Member] | Money Market Funds [Member] |  |
Assumptions Used in Calculations (Numeric) [Abstract] |  |
Number of months from date of purchase that investment must mature | 13 months |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | $ 19 | $ 20
Other Postretirement Benefits Plan [Member] | Money Market Funds [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 19 | 20
Other Postretirement Benefits Plan [Member] | Money Market Funds [Member] | Level 2 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | 0 | 0
Other Postretirement Benefits Plan [Member] | Money Market Funds [Member] | Level 3 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value not using net asset value per share | $ 0 | $ 0
Other Postretirement Benefits Plan [Member] | Equity Securities [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 45.00% | 46.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 45.00% |
Other Postretirement Benefits Plan [Member] | United States Large Cap Equity Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | $ 71 | $ 76
Other Postretirement Benefits Plan [Member] | Commingled Debt Equity Securities [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | $ 78 | $ 84
Other Postretirement Benefits Plan [Member] | Debt Securities [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 49.00% | 48.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 49.00% |
Other Postretirement Benefits Plan [Member] | Total Trust Assets Prior to Adjustments [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | $ 312 | $ 326
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 326 |
Balance at end of period | 312 | 326
Other Postretirement Benefits Plan [Member] | Receivables And Payables Net [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | (9) | (12)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (12) |
Balance at end of period | (9) | (12)
Other Postretirement Benefits Plan [Member] | Account 401 H [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 114 | 124
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 124 |
Balance at end of period | 114 | 124
Other Postretirement Benefits Plan [Member] | Global equity exchange traded-fund [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 70 | 72
Other Postretirement Benefits Plan [Member] | Global equity exchange traded-fund [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 70 | 72
Other Postretirement Benefits Plan [Member] | Long-term bond exchange-traded fund [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 74 | 74
Other Postretirement Benefits Plan [Member] | Long-term bond exchange-traded fund [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Measured at fair value using net asset value per share | 74 | 74
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 3 [Member] |  |
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Actual return on plan assets relating to assets still held at the reporting date | (2) |
Actual return on plan assets relating to assets sold during the period | $ 7 |
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | Master Trust [Member] | Corporate Debt Securities [Member] | Level 3 [Member] | U.S. [Member] |  |
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Actual return on plan assets relating to assets still held at the reporting date |  | (2)
Actual return on plan assets relating to assets sold during the period |  | $ 4

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