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