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Employee Benefit Plans (Pension and Postretirement Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits | 86.00% | 87.00% |
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits | 11.00% | 10.00% |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 49,400 | $ 48,800 |
Fair value of plan assets | $ 48,945 | $ 47,960 |
Nonqualified Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits | 3.00% | 3.00% |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 1,467 | $ 1,650 | $ 1,885
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Percent Of Plan Assets Concentrated in Individual Investment | 5.00% |  |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan amendments | $ 0 | 0 |
Net settlement and curtailment gain (loss) | $ 2 | $ 3 | $ 0
Expected return on plan assets, net cost | 6.80% | 5.70% | 5.70%
Fair value of plan assets | $ 316 | $ 302 | $ 389
Other Postretirement Benefits Plan [Member] | Asset Held in Trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 93 | 105 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan amendments | 19 | 131 |
Net settlement and curtailment gain (loss) | $ (6) | $ (2) | $ (22)
Expected return on plan assets, net cost | 7.10% | 6.50% | 6.50%
Derivative, Fair Value, Net | $ 345 | $ (79) |
Fair value of plan assets | $ 48,945 | 47,960 | $ 63,323
Pension Plan [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Range Of Growth Seeking Assets In Company's Overall Investment Strategy | 46.00% |  |
Range Of Income Generating Assets In Company's Overall Investment Strategy | 74.00% |  |
Percentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge | 80.00% |  |
Pension Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Range Of Growth Seeking Assets In Company's Overall Investment Strategy | 26.00% |  |
Range Of Income Generating Assets In Company's Overall Investment Strategy | 54.00% |  |
VEBA [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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- Definition This represents the percentage of which the Fixed Income Portfolio is designed to hedge the interest rate sensitivity of the pension plan liabilities. + References No definition available. + Details
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- Definition Percentage of the projected benefit obligation that is comprised of qualified domestic plan benefits. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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