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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Total recognized in OCI | $ (279) | $ (328) | $ (181)
Pension Benefits |  |  |
Net periodic benefit costs [Abstract] |  |  |
Service costs | 187 | 215 | 226
Interest costs | 328 | 342 | 363
Settlement and curtailment (gains) losses | 5 | (7) | 10
Expected return on plan assets | (516) | (506) | (528)
Amortization of net actuarial (gains) losses | 129 | 162 | 189
Amortization of prior service costs (credit) | (11) | (12) | (14)
Total net periodic benefit costs (credit) | 122 | 194 | 246
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net actuarial (gains) losses | 2 | (166) | (35)
Prior service costs (credit) | 8 | 1 | 0
Amortization of net actuarial (gains) losses | (129) | (162) | (189)
Amortization of prior service (costs) credit | 11 | 12 | 14
Settlement and curtailment (gains) losses | (5) | (10) | (10)
Total recognized in OCI | (120) | (333) | (215)
Total recognized in net periodic benefit costs and OCI | 2 | (139) | 31
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 | (7) | (8) | 5
Other Postretirement Benefits |  |  |
Net periodic benefit costs [Abstract] |  |  |
Service costs | 4 | 4 | 5
Interest costs | 34 | 37 | 42
Settlement and curtailment (gains) losses | 0 | 1 | 0
Expected return on plan assets | (55) | (56) | (62)
Amortization of net actuarial (gains) losses | (25) | (39) | (74)
Amortization of prior service costs (credit) | 0 | 0 | (3)
Total net periodic benefit costs (credit) | (42) | (53) | (92)
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net actuarial (gains) losses | (191) | (54) | (42)
Prior service costs (credit) | 0 | (1) | 0
Amortization of net actuarial (gains) losses | 25 | 39 | 74
Amortization of prior service (costs) credit | 0 | 0 | 3
Settlement and curtailment (gains) losses | 0 | 10 | 0
Total recognized in OCI | (166) | (6) | 35
Total recognized in net periodic benefit costs and OCI | (208) | (59) | (57)
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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