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Employee Benefit Plans (Narrative) (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] |  |  |  |
Qualified Pension Plan | 80.00% |  |  |
Pension Benefit Percent Allocation Traditional | 62.00% |  |  |
Pension Benefit Percent Allocation Cash Balance | 38.00% |  |  |
Percentage of annual salary Contributed by the Company for employees (401(k) plans) | 4.00% |  |  |
General And Administrative Expense |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Contribution Plan, Cost | $ 79 | $ 77 | $ 80 |
Other liabilities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net accumulated liability for non-retiree postemployment benefits provided to former or inactive employee | 27 | 30 |  |
Rabbi Trust |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 893 | 1,026 |  |
Fair value of plan assets | 118 | 983 |  |
Defined Benefit Plan, Plan Assets, Amount | 118 | 983 |  |
Loans, Gross, Insurance Policy | 900 | 0 |  |
Rabbi Trust | Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 57 | 58 |  |
Fair value of plan assets | 77 | 80 |  |
Defined Benefit Plan, Plan Assets, Amount | 77 | 80 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 11,238 | 11,099 | 14,787 |
Fair value of plan assets | $ 12,649 | $ 12,519 | $ 15,242 |
Bond Yield rate used in determining Discount rate | 5.30% | 5.45% | 2.85% | 2.55%
Expected long-term rate of return on plan assets | 7.50% | 7.50% | 6.00% | 5.75%
Defined Benefit Plans Estimated Future Employer Contributions in Next Fiscal Year | $ 180 |  |  |
Defined Benefit Plan, Plan Assets, Amount | 12,649 | $ 12,519 | $ 15,242 |
Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 1,032 | 1,348 | 1,793 |
Fair value of plan assets | $ 1,186 | $ 1,191 | $ 1,621 |
Bond Yield rate used in determining Discount rate | 5.20% | 5.55% | 2.75% | 2.40%
Expected long-term rate of return on plan assets | 6.75% | 7.75% | 7.00% | 6.75%
Defined Benefit Plans Estimated Future Employer Contributions in Next Fiscal Year | $ 10 |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 1,186 | $ 1,191 | $ 1,621 |
Maximum | Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Requisite Age | 55 years |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 20 years |  |  |
Minimum | Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Requisite Age | 50 years |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 10 years |  |  |
Foreign plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Weighted Average Asset Allocations | 3.00% |  |  |
Foreign plans | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension benefits for foreign plans percentage of the ending benefit obligation | 11.00% | 12.00% |  |

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