Retirement and Postemployment Benefits (Plan Assets and Expected Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member] | U.S. [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period	$ 3,887	$ 4,068
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	4,068	3,585
Balance at end of period	3,887	4,068
Defined Benefit Plan Estimated Future Employer Contributions (Numeric) [Abstract]
Employer contributions	47	$ 115
Expected amount of benefit payments in the next period for non-qualified plans	10
Estimated Future Benefit Payments (Details) [Abstract]
2022	207
2023	207
2024	204
2025	204
2026	202
2027-2030	$ 946
Pension Plan [Member] | U.S. [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	$ 111
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	$ 3,887	$ 4,068
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	4,068
Balance at end of period	$ 3,887	$ 4,068
Pension Plan [Member] | U.S. [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	$ 111
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	$ 3,887	$ 4,068
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	4,068
Balance at end of period	3,887	4,068
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Level 1 [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period	587	695
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	695
Balance at end of period	587	695
Pension Plan [Member] | U.S. [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	587	695
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	695
Balance at end of period	587	695
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Level 2 [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period	1,069	1,007
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	1,007
Balance at end of period	1,069	1,007
Pension Plan [Member] | U.S. [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	1,069	1,007
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	1,007
Balance at end of period	1,069	1,007
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Level 3 [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period	20	15
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	15	24
Purchases, sales and settlements	5	(9)
Balance at end of period	20	15
Pension Plan [Member] | U.S. [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	20	15
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	15	24
Purchases, sales and settlements	5	(9)
Balance at end of period	20	15
Pension Plan [Member] | U.S. [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	266	300
Pension Plan [Member] | U.S. [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	266	300
Pension Plan [Member] | U.S. [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	266	300
Pension Plan [Member] | U.S. [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	266	300
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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] | U.S. [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] | U.S. [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	754	742
Measured at fair value not using net asset value per share	41	60
Pension Plan [Member] | U.S. [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	754	742
Measured at fair value not using net asset value per share	41	60
Pension Plan [Member] | U.S. [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	41	60
Pension Plan [Member] | U.S. [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	41	60
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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] | U.S. [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] | U.S. [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	511	566
Pension Plan [Member] | U.S. [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	511	566
Pension Plan [Member] | U.S. [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	677	712
Pension Plan [Member] | U.S. [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	677	712
Pension Plan [Member] | U.S. [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	281	336
Pension Plan [Member] | U.S. [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	281	336
Pension Plan [Member] | U.S. [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	280	335
Pension Plan [Member] | U.S. [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	280	335
Pension Plan [Member] | U.S. [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	1
Pension Plan [Member] | U.S. [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	1
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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	1,039	1,045
Pension Plan [Member] | U.S. [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	1,039	1,045
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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	1,019	1,030
Pension Plan [Member] | U.S. [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	1,019	1,030
Pension Plan [Member] | U.S. [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	20	15
Fair value at end of period	20	15
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	15	20
Purchases, sales and settlements	5	(5)
Balance at end of period	20	15
Pension Plan [Member] | U.S. [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	20	15
Fair value at end of period	20	15
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	15	20
Purchases, sales and settlements	5	(5)
Balance at end of period	20	15
Pension Plan [Member] | U.S. [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	13
Pension Plan [Member] | U.S. [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	13
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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	13
Pension Plan [Member] | U.S. [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	13
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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	69	76
Pension Plan [Member] | U.S. [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	69	76
Pension Plan [Member] | U.S. [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	4,017	4,110
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	4,110
Balance at end of period	4,017	4,110
Pension Plan [Member] | U.S. [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	4,017	4,110
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	4,110
Balance at end of period	4,017	4,110
Pension Plan [Member] | U.S. [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	94	68
Pension Plan [Member] | U.S. [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	94	68
Pension Plan [Member] | U.S. [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	236	223
Pension Plan [Member] | U.S. [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	236	223
Pension Plan [Member] | U.S. [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	35	(37)
Pension Plan [Member] | U.S. [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	35	(37)
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [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	35	(37)
Pension Plan [Member] | U.S. [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	35	(37)
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [Member] | Master Trust [Member] | Insurance Contracts [Member] | Level 3 [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period		0
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	0	4
Purchases, sales and settlements		(4)
Balance at end of period		0
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Insurance Contracts [Member] | Level 3 [Member] | LKE [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period		0
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	0	4
Purchases, sales and settlements		(4)
Balance at end of period		0
Pension Plan [Member] | U.S. [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	25	116
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	116
Balance at end of period	25	116
Pension Plan [Member] | U.S. [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	25	116
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	116
Balance at end of period	25	116
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Account 401 H [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period	(155)	(158)
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	(158)
Balance at end of period	(155)	(158)
Pension Plan [Member] | U.S. [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	(155)	(158)
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	(158)
Balance at end of period	(155)	(158)
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Limited Partner
Defined benefit plan fair value of plan assets (Details) [Abstract]
Measured at fair value using net asset value per share	0	6
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Limited Partner | LKE [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Measured at fair value using net asset value per share	$ 0	$ 6
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Growth Portfolio [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	55.00%	56.00%
Target Allocations (Details ) [Abstract]
Target asset allocation	55.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Growth Portfolio [Member] | LKE [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	55.00%	56.00%
Target Allocations (Details ) [Abstract]
Target asset allocation	55.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Growth Portfolio [Member] | Equity Securities [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	32.00%	34.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Growth Portfolio [Member] | Equity Securities [Member] | LKE [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	32.00%	34.00%
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [Member] | Master Trust [Member] | Growth Portfolio [Member] | Alternative Investments [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	10.00%	9.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Growth Portfolio [Member] | Alternative Investments [Member] | LKE [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	10.00%	9.00%
Pension Plan [Member] | U.S. [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] | U.S. [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] | U.S. [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Debt Securities [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	35.00%	33.00%
Pension Plan [Member] | U.S. [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%	33.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Derivatives [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	8.00%	10.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Immunizing Portfolio [Member] | Derivatives [Member] | LKE [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	8.00%	10.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Liquidity Portfolio [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	2.00%	1.00%
Target Allocations (Details ) [Abstract]
Target asset allocation	2.00%
Pension Plan [Member] | U.S. [Member] | Master Trust [Member] | Liquidity Portfolio [Member] | LKE [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	2.00%	1.00%
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	$ 367	$ 367
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	367	340
Balance at end of period	367	367
Defined Benefit Plan Estimated Future Employer Contributions (Numeric) [Abstract]
Employer contributions	18	18
Amount to be contributed to plan in the next fiscal year	22
Estimated Future Benefit Payments (Details) [Abstract]
2022	44
2023	42
2024	41
2025	40
2026	38
2027-2030	176
Expected Federal Subsidy (Details) [Abstract]
Federal subsidy 2022	1
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	6	5
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	5
Balance at end of period	6	5
Other Postretirement Benefits Plan [Member] | Level 2 [Member]
Defined benefit plan fair value of plan assets (Details) [Abstract]
Fair value at end of period	38	39
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	39
Balance at end of period	38	39
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	3.00%	3.00%
Target Allocations (Details ) [Abstract]
Target asset allocation	5.00%
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	$ 6	$ 5
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	6	5
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%	42.00%
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	$ 96	$ 89
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	$ 75	$ 77
Other Postretirement Benefits Plan [Member] | Debt Securities [Member]
Actual Allocation by Plan Asset (Details) [Abstract]
Percentage of trust assets	52.00%	55.00%
Target Allocations (Details ) [Abstract]
Target asset allocation	50.00%
Other Postretirement Benefits Plan [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	$ 0	$ 2
Other Postretirement Benefits Plan [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	0	0
Other Postretirement Benefits Plan [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	2
Other Postretirement Benefits Plan [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
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	38	37
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	38	37
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	215	210
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	210
Balance at end of period	215	210
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	(3)	(1)
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	(1)
Balance at end of period	(3)	(1)
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	155	158
Change in Fair Value of Level 3 Plan Assets [Roll Forward]
Balance at beginning of period	158
Balance at end of period	$ 155	$ 158