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Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost and Other Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Non-operating expense        
Total net periodic benefit cost (benefit) $ 23 $ 796 $ 51 $ 785
Postretirement benefits        
Operating expense        
Service cost 5 5 9 12
Non-operating expense        
Interest cost 19 21 38 43
Expected return on plan assets (14) (15) (28) (34)
Amortization of transition asset 0 0 0 0
Amortization of prior service benefit (3) (6) (4) (12)
Amortization of net actuarial loss 3 4 8 10
Settlements, curtailments, special termination benefits and other 0 0 0 0
Total non-operating expense (benefit) 5 4 14 7
Total net periodic benefit cost (benefit) 10 9 23 19
Service cost - continuing operations     9 11
Service cost - discontinued operations     0 1
Postretirement benefits | Continuing Operations        
Non-operating expense        
Total non-operating expense (benefit) - continuing operations     14 7
Total net periodic benefit cost (benefit) - continuing operations     23 18
Postretirement benefits | Discontinued Operations        
Non-operating expense        
Total non-operating expense (benefit) - discontinued operations     0 0
Total net periodic benefit cost (benefit) - discontinued operations     0 1
United States | U.S. Pension Plans        
Operating expense        
Service cost 25 29 51 66
Non-operating expense        
Interest cost 109 141 217 301
Expected return on plan assets (142) (196) (284) (433)
Amortization of transition asset 0 0 0 0
Amortization of prior service benefit 0 (4) 0 (8)
Amortization of net actuarial loss 69 83 138 178
Settlements, curtailments, special termination benefits and other 0 795 0 795
Total non-operating expense (benefit) 36 819 71 833
Total net periodic benefit cost (benefit) 61 848 122 899
Service cost - continuing operations     51 59
Service cost - discontinued operations     0 7
United States | U.S. Pension Plans | Continuing Operations        
Non-operating expense        
Total non-operating expense (benefit) - continuing operations     71 833
Total net periodic benefit cost (benefit) - continuing operations     122 892
United States | U.S. Pension Plans | Discontinued Operations        
Non-operating expense        
Total non-operating expense (benefit) - discontinued operations     0 0
Total net periodic benefit cost (benefit) - discontinued operations     0 7
International | U.S. Pension Plans        
Operating expense        
Service cost 13 14 24 35
Non-operating expense        
Interest cost 46 49 92 103
Expected return on plan assets (66) (80) (131) (167)
Amortization of transition asset 0 1 0 2
Amortization of prior service benefit 0 0 1 1
Amortization of net actuarial loss 2 3 4 6
Settlements, curtailments, special termination benefits and other 0 0 0 0
Total non-operating expense (benefit) (18) (27) (34) (55)
Total net periodic benefit cost (benefit) $ (5) $ (13) (10) (20)
Service cost - continuing operations     24 30
Service cost - discontinued operations     0 5
International | U.S. Pension Plans | Continuing Operations        
Non-operating expense        
Total non-operating expense (benefit) - continuing operations     (34) (55)
Total net periodic benefit cost (benefit) - continuing operations     (10) (25)
International | U.S. Pension Plans | Discontinued Operations        
Non-operating expense        
Total non-operating expense (benefit) - discontinued operations     0 0
Total net periodic benefit cost (benefit) - discontinued operations     $ 0 $ 5