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v3.22.4

Retirement and Postemployment Benefits (Plan Assets and Expected Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Pension Plan [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | $ 3,149 | $ 3,887
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,887 | 4,068
Balance at end of period | 3,149 | 3,887
Defined Benefit Plan Estimated Future Employer Contributions (Numeric) [Abstract] |  |
Employer contributions | 9 | $ 47
Expected amount of benefit payments in the next period for non-qualified plans | 10 |
Estimated Future Benefit Payments (Details) [Abstract] |  |
2022 | 282 |
2023 | 281 |
2024 | 283 |
2025 | 280 |
2026 | 275 |
2027-2030 | $ 1,327 |
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 | $ 116 |
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 | $ 3,149 | $ 3,887
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,887 |
Balance at end of period | $ 3,149 | $ 3,887
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 | $ 116 |
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 | $ 3,149 | $ 3,887
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 3,887 |
Balance at end of period | 3,149 | 3,887
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 | 493 | 587
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 587 |
Balance at end of period | 493 | 587
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 | 493 | 587
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 587 |
Balance at end of period | 493 | 587
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 | 840 | 1,069
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 1,069 |
Balance at end of period | 840 | 1,069
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 | 840 | 1,069
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 1,069 |
Balance at end of period | 840 | 1,069
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 | 16 | 20
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 20 |
Balance at end of period | 16 | 20
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 | 16 | 20
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 20 |
Balance at end of period | 16 | 20
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 | 306 | 266
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 | 306 | 266
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 | 306 | 266
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 | 306 | 266
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 | 574 | 754
Measured at fair value not using net asset value per share | 34 | 41
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 | 574 | 754
Measured at fair value not using net asset value per share | 34 | 41
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 | 34 | 41
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 | 34 | 41
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 | 403 | 511
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 | 403 | 511
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 | 526 | 677
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 | 526 | 677
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 | 153 | 281
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 | 153 | 281
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 | 153 | 280
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 | 153 | 280
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 | 0 | 1
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 | 0 | 1
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 | 834 | 1,039
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 | 834 | 1,039
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 | 818 | 1,019
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 | 818 | 1,019
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 | 16 | 20
Fair value at end of period | 16 | 20
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 20 | 15
Purchases, sales and settlements | (4) | 5
Balance at end of period | 16 | 20
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 | 16 | 20
Fair value at end of period | 16 | 20
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 20 | 15
Purchases, sales and settlements | (4) | 5
Balance at end of period | 16 | 20
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 | 2 |
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 | 14 | 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 | 14 | 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 | 14 | 14
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 | 14 | 14
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 | 0
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 | 0
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 | 60 | 69
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 | 60 | 69
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 | 3,208 | 4,017
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 4,017 |
Balance at end of period | 3,208 | 4,017
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 | 3,208 | 4,017
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 4,017 |
Balance at end of period | 3,208 | 4,017
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 | 96 | 92
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 | 96 | 92
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 | 194 | 236
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 | 194 | 236
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 | 8 | 35
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 | 8 | 35
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 | 8 | 35
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 | 8 | 35
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 | 67 | 25
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 25 |
Balance at end of period | 67 | 25
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 | 67 | 25
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 25 |
Balance at end of period | 67 | 25
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 | (126) | (155)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (155) |
Balance at end of period | (126) | (155)
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 | (126) | (155)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (155) |
Balance at end of period | (126) | (155)
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 | 6 | 2
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 | $ 6 | $ 2
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 55.00% | 55.00%
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% | 55.00%
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 | 31.00% | 32.00%
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 | 31.00% | 32.00%
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% | 13.00%
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% | 13.00%
Pension Plan [Member] | Master Trust [Member] | Growth Portfolio [Member] | Alternative Investments [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 11.00% | 10.00%
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 | 11.00% | 10.00%
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 | 33.00% | 35.00%
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 | 33.00% | 35.00%
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Derivatives [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 10.00% | 8.00%
Pension Plan [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Derivatives [Member] | LKE [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 10.00% | 8.00%
Pension Plan [Member] | Master Trust [Member] | Liquidity Portfolio [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 2.00% | 2.00%
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% | 2.00%
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 | $ 367
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 367 | 367
Balance at end of period | 417 | 367
Defined Benefit Plan Estimated Future Employer Contributions (Numeric) [Abstract] |  |
Employer contributions | 19 | 18
Amount to be contributed to plan in the next fiscal year | 27 |
Estimated Future Benefit Payments (Details) [Abstract] |  |
2022 | 51 |
2023 | 50 |
2024 | 49 |
2025 | 48 |
2026 | 48 |
2027-2030 | 225 |
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 | 1 |
Other Postretirement Benefits Plan [Member] | Level 1 [Member] |  |
Defined benefit plan fair value of plan assets (Details) [Abstract] |  |
Fair value at end of period | 145 | 6
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 6 |
Balance at end of period | 145 | 6
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 | 38
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 38 |
Balance at end of period | 0 | 38
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 | 7.00% | 3.00%
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 | $ 6
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 | 6
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% | 45.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 44.00% |
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 | $ 96
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 | $ 77 | $ 75
Other Postretirement Benefits Plan [Member] | Debt Securities [Member] |  |
Actual Allocation by Plan Asset (Details) [Abstract] |  |
Percentage of trust assets | 48.00% | 52.00%
Target Allocations (Details ) [Abstract] |  |
Target asset allocation | 50.00% |
Other Postretirement Benefits Plan [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 | $ 0 | $ 38
Other Postretirement Benefits Plan [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
Other Postretirement Benefits Plan [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 | 0 | 38
Other Postretirement Benefits Plan [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 | 0 | 0
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 | 293 | 215
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 215 |
Balance at end of period | 293 | 215
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 | (2) | (3)
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | (3) |
Balance at end of period | (2) | (3)
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 | 126 | 155
Change in Fair Value of Level 3 Plan Assets [Roll Forward] |  |
Balance at beginning of period | 155 |
Balance at end of period | 126 | $ 155
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 | 61 |
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 | 61 |
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 | 65 |
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 | 65 |
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 | $ 2 |

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