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Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost and Other Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Non-operating expense |  |  |
Total net periodic benefit cost (benefit) | $ 828 | $ (109) | $ (232)
Postretirement Benefits |  |  |
Operating expense |  |  |
Service cost | 21 | 27 | 42
Total non-operating expense (benefit) - continuing operations | 14 | (10) | (7)
Total non-operating expense (benefit) - discontinued operations | 0 | (2) | (2)
Non-operating expense |  |  |
Interest cost | 80 | 87 | 52
Expected return on plan assets | (65) | (77) | (72)
Amortization of transition asset | 0 | 0 | 0
Amortization of prior service benefit | (22) | (31) | (31)
Amortization of net actuarial loss | 20 | 9 | 40
Settlements, curtailments, special termination benefits and other | 1 | 0 | 2
Total non-operating expense (benefit) | 14 | (12) | (9)
Total net periodic benefit cost (benefit) | 35 | 15 | 33
Service cost - continuing operations | 20 | 23 | 35
Service cost - discontinued operations | 1 | 4 | 7
Total net periodic benefit cost (benefit) - continuing operations | 34 | 13 | 28
Total net periodic benefit cost (benefit) - discontinued operations | 1 | 2 | 5
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset | 0 | 0 | 0
Prior service cost (benefit) | 0 | 0 | 0
Amortization of prior service benefit | 22 | 31 | 31
Net actuarial (gain) loss | (69) | 100 | (166)
Amortization of net actuarial loss | (20) | (9) | (40)
Foreign currency | 2 | 0 | 2
Settlements, curtailments, special termination benefits and other | (1) | 0 | (2)
Total recognized in other comprehensive (income) loss | (66) | 122 | (175)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (31) | 137 | (142)
United States | U.S. Pension Plans |  |  |
Operating expense |  |  |
Service cost | 123 | 171 | 256
Total non-operating expense (benefit) - continuing operations | 921 | (32) | (111)
Total non-operating expense (benefit) - discontinued operations | 0 | (17) | (23)
Non-operating expense |  |  |
Interest cost | 522 | 662 | 417
Expected return on plan assets | (714) | (974) | (963)
Amortization of transition asset | 0 | 0 | 0
Amortization of prior service benefit | (15) | (24) | (24)
Amortization of net actuarial loss | 307 | 292 | 424
Settlements, curtailments, special termination benefits and other | 821 | (5) | 12
Total non-operating expense (benefit) | 921 | (49) | (134)
Total net periodic benefit cost (benefit) | 1,044 | 122 | 122
Service cost - continuing operations | 116 | 139 | 209
Service cost - discontinued operations | 7 | 32 | 47
Total net periodic benefit cost (benefit) - continuing operations | 1,037 | 107 | 98
Total net periodic benefit cost (benefit) - discontinued operations | 7 | 15 | 24
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset | 0 | 0 | 0
Prior service cost (benefit) | 0 | 0 | 0
Amortization of prior service benefit | 15 | 24 | 24
Net actuarial (gain) loss | (105) | 495 | 61
Amortization of net actuarial loss | (307) | (292) | (424)
Foreign currency | 0 | 0 | 0
Settlements, curtailments, special termination benefits and other | (821) | 5 | (12)
Total recognized in other comprehensive (income) loss | (1,218) | 232 | (351)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (174) | 354 | (229)
International | U.S. Pension Plans |  |  |
Operating expense |  |  |
Service cost | 63 | 76 | 128
Total non-operating expense (benefit) - continuing operations | (107) | (67) | (114)
Total non-operating expense (benefit) - discontinued operations | 0 | (1) | 9
Non-operating expense |  |  |
Interest cost | 200 | 225 | 125
Expected return on plan assets | (322) | (307) | (271)
Amortization of transition asset | 2 | 2 | 2
Amortization of prior service benefit | 1 | 2 | 0
Amortization of net actuarial loss | 11 | 7 | 29
Settlements, curtailments, special termination benefits and other | 1 | 3 | 10
Total non-operating expense (benefit) | (107) | (68) | (105)
Total net periodic benefit cost (benefit) | (44) | 8 | 23
Service cost - continuing operations | 58 | 60 | 107
Service cost - discontinued operations | 5 | 16 | 21
Total net periodic benefit cost (benefit) - continuing operations | (49) | (7) | (7)
Total net periodic benefit cost (benefit) - discontinued operations | 5 | 15 | 30
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset | (2) | (2) | (2)
Prior service cost (benefit) | 0 | (1) | 8
Amortization of prior service benefit | (1) | (2) | 0
Net actuarial (gain) loss | 85 | 166 | (689)
Amortization of net actuarial loss | (11) | (7) | (29)
Foreign currency | (36) | 3 | (82)
Settlements, curtailments, special termination benefits and other | (1) | 0 | (4)
Total recognized in other comprehensive (income) loss | 34 | 157 | (798)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | $ (10) | $ 165 | $ (775)

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