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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