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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)