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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 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  |  |  | $ 2,100
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits |  | 87.00% | 86.00% |
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits |  | 10.00% | 11.00% |
Defined Benefit Plan, Accumulated Benefit Obligation |  | $ 48,800 | $ 66,500 |
Fair value of plan assets |  | 47,960 | 63,323 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1,650 | $ 1,885 | 1,649
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Percent Of Plan Assets Concentrated in Individual Investment |  | 5.00% |  |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits |  | 3.00% | 3.00% |
UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discretionary Pension Contributions |  |  |  | 750
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  | 51
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  | $ 0 | $ 0 |
Net settlement and curtailment gain (loss) |  | $ 3 | $ 0 | $ (1)
Expected return on plan assets, net cost |  | 5.70% | 5.70% | 5.70%
Fair value of plan assets |  | $ 302 | $ 389 | $ 381
Other Postretirement Benefits Plan [Member] | Asset Held in Trust [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 105 | 147 |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan amendments |  | 131 | 59 |
Net settlement and curtailment gain (loss) |  | $ (2) | $ (22) | $ (45)
Expected return on plan assets, net cost |  | 6.50% | 6.50% | 6.50%
Derivative, Fair Value, Net |  | $ (79) | $ 98 |
Fair value of plan assets |  | $ 47,960 | 63,323 | $ 62,318
Pension Plan [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets, net cost | 7.10% |  |  |
Pension Plan [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Range Of Growth Seeking Assets In Company's Overall Investment Strategy |  | 45.00% |  |
Range Of Income Generating Assets In Company's Overall Investment Strategy |  | 60.00% |  |
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 |  | 40.00% |  |
Range Of Income Generating Assets In Company's Overall Investment Strategy |  | 55.00% |  |
Percentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge |  | 40.00% |  |
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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