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Employee Benefit Plans (Schedule of Defined Benefit Plan Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other | $ (51) | $ 65 | $ 23
Fair value of plan assets | 48,945 | 47,960 |
Noncurrent liability | (2,385) | (4,807) |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligations | 49,592 | 49,028 | 67,214
Service cost | 222 | 470 | 523
Interest cost | 2,507 | 1,520 | 1,249
Actuarial loss (gain) | 1,909 | (15,466) |
Total benefits paid (1) | (4,258) | (4,328) |
Net settlement, curtailment, and special termination benefits | 5 | 3 |
Plan amendments | 19 | 131 |
Other | 160 | (516) |
Fair value of plan assets | 48,945 | 47,960 | 63,323
Actual return on plan assets | 4,730 | (10,841) |
Employer contributions (1) | 363 | 306 |
Total benefits paid (1) | (4,258) | (4,328) |
Settlements | (2) | (4) |
Other (2) | 152 | (496) |
Funded status of plan | (647) | (1,068) |
Noncurrent assets | 1,296 | 3,301 |
Current liability | (206) | (236) |
Noncurrent liability | (1,737) | (4,133) |
Net amount recognized | (647) | (1,068) |
Net actuarial loss (gain) | 4,311 | 2,950 |
Prior service credit | (1,246) | (1,424) |
Net amount recognized | 3,065 | 1,526 |
Pension Plan [Member] | Continuing operations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 222 | 470 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligations | 962 | 984 | 1,370
Service cost | 3 | 6 | 7
Interest cost | 50 | 29 | 24
Actuarial loss (gain) | 53 | (294) |
Total benefits paid (1) | (176) | (166) |
Net settlement, curtailment, and special termination benefits | (9) | (8) |
Plan amendments | 0 | 0 |
Other | 57 | 47 |
Fair value of plan assets | 316 | 302 | $ 389
Actual return on plan assets | 37 | (63) |
Employer contributions (1) | 106 | 98 |
Total benefits paid (1) | (176) | (166) |
Settlements | (9) | (8) |
Other (2) | 56 | 52 |
Funded status of plan | (646) | (682) |
Noncurrent assets | 0 | 0 |
Current liability | (64) | (71) |
Noncurrent liability | (582) | (611) |
Net amount recognized | (646) | (682) |
Net actuarial loss (gain) | (325) | (394) |
Prior service credit | (3) | (4) |
Net amount recognized | (328) | (398) |
Other Postretirement Benefits Plan [Member] | Continuing operations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 3 | $ 6 |

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