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Employee Benefit Plans (Net Periodic Benefit Costs and Other Changes Recognized in OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Total recognized in OCI | $ 88 | $ (279) | $ (328)
Pension Benefits |  |  |
Net periodic benefit costs [Abstract] |  |  |
Service costs | 143 | 187 | 215
Interest costs | 474 | 328 | 342
Settlement and curtailment (gains) losses | 6 | 5 | (7)
Expected return on plan assets | (480) | (516) | (506)
Amortization of net actuarial (gains) losses | 159 | 129 | 162
Amortization of prior service costs (credit) | (11) | (11) | (12)
Total net periodic benefit costs (credit) | 291 | 122 | 194
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net actuarial (gains) losses | 250 | 2 | (166)
Prior service costs (credit) | 0 | 8 | 1
Amortization of net actuarial (gains) losses | (159) | (129) | (162)
Amortization of prior service (costs) credit | 11 | 11 | 12
Settlement and curtailment (gains) losses | (6) | (5) | (10)
Total recognized in OCI | 94 | (120) | (333)
Total recognized in net periodic benefit costs and OCI | 385 | 2 | (139)
Pension Benefits | Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments |  |  |
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Total recognized in OCI | (2) | (7) | (8)
Other Postretirement Benefits |  |  |
Net periodic benefit costs [Abstract] |  |  |
Service costs | 3 | 4 | 4
Interest costs | 43 | 34 | 37
Settlement and curtailment (gains) losses | 0 | 0 | 1
Expected return on plan assets | (54) | (55) | (56)
Amortization of net actuarial (gains) losses | (30) | (25) | (39)
Amortization of prior service costs (credit) | 0 | 0 | 0
Total net periodic benefit costs (credit) | (38) | (42) | (53)
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net actuarial (gains) losses | (41) | (191) | (54)
Prior service costs (credit) | 0 | 0 | (1)
Amortization of net actuarial (gains) losses | 30 | 25 | 39
Amortization of prior service (costs) credit | 0 | 0 | 0
Settlement and curtailment (gains) losses | 0 | 0 | 10
Total recognized in OCI | (11) | (166) | (6)
Total recognized in net periodic benefit costs and OCI | (49) | (208) | (59)
Other Postretirement Benefits | Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments |  |  |
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Total recognized in OCI | $ 0 | $ 0 | $ 0

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