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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Non-operating expense |  |  |
Total net periodic benefit cost (benefit) | $ (129) | $ (248) | $ (297)
Postretirement Benefits |  |  |
Operating expense |  |  |
Service cost | 27 | 42 | 53
Non-operating expense |  |  |
Interest cost | 87 | 52 | 43
Expected return on plan assets | (77) | (72) | (78)
Amortization of transition asset | 0 | 0 | 0
Amortization of prior service benefit | (31) | (31) | (33)
Amortization of net actuarial loss | 9 | 40 | 56
Settlements, curtailments, special termination benefits and other | 0 | 2 | 3
Total non-operating expense (benefit) | (12) | (9) | (9)
Total net periodic benefit cost (benefit) | 15 | 33 | 44
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 | 31 | 31 | 33
Net actuarial (gain) loss | 100 | (166) | (104)
Amortization of net actuarial loss | (9) | (40) | (56)
Foreign currency | 0 | 2 | (1)
Settlements, curtailments, special termination benefits and other | 0 | (2) | (3)
Total recognized in other comprehensive (income) loss | 122 | (175) | (131)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | 137 | (142) | (87)
United States | U.S. Pension Plans |  |  |
Operating expense |  |  |
Service cost | 171 | 256 | 286
Non-operating expense |  |  |
Interest cost | 662 | 417 | 360
Expected return on plan assets | (974) | (963) | (1,055)
Amortization of transition asset | 0 | 0 | 0
Amortization of prior service benefit | (24) | (24) | (24)
Amortization of net actuarial loss | 292 | 424 | 529
Settlements, curtailments, special termination benefits and other | (5) | 12 | 24
Total non-operating expense (benefit) | (49) | (134) | (166)
Total net periodic benefit cost (benefit) | 122 | 122 | 120
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 | 24 | 24 | 24
Net actuarial (gain) loss | 495 | 61 | (614)
Amortization of net actuarial loss | (292) | (424) | (529)
Foreign currency | 0 | 0 | 0
Settlements, curtailments, special termination benefits and other | 5 | (12) | (23)
Total recognized in other comprehensive (income) loss | 232 | (351) | (1,142)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | 354 | (229) | (1,022)
International | U.S. Pension Plans |  |  |
Operating expense |  |  |
Service cost | 76 | 128 | 164
Non-operating expense |  |  |
Interest cost | 225 | 125 | 98
Expected return on plan assets | (307) | (271) | (326)
Amortization of transition asset | 2 | 2 | 2
Amortization of prior service benefit | 2 | 0 | (3)
Amortization of net actuarial loss | 7 | 29 | 104
Settlements, curtailments, special termination benefits and other | 3 | 10 | 3
Total non-operating expense (benefit) | (68) | (105) | (122)
Total net periodic benefit cost (benefit) | 8 | 23 | 42
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) | (1) | 8 | 1
Amortization of prior service benefit | (2) | 0 | 3
Net actuarial (gain) loss | 166 | (689) | (434)
Amortization of net actuarial loss | (7) | (29) | (104)
Foreign currency | 3 | (82) | (71)
Settlements, curtailments, special termination benefits and other | 0 | (4) | (1)
Total recognized in other comprehensive (income) loss | 157 | (798) | (608)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | $ 165 | $ (775) | $ (566)

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