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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
Mar. 31, 2025
Mar. 31, 2024
Non-operating expense    
Total net periodic benefit cost (benefit) $ 28 $ (11)
Postretirement benefits    
Operating expense    
Service cost 4 7
Non-operating expense    
Interest cost 19 22
Expected return on plan assets (14) (19)
Amortization of transition asset 0 0
Amortization of prior service benefit (1) (6)
Amortization of net actuarial loss 5 6
Total non-operating expense (benefit) 9 3
Total net periodic benefit cost (benefit) 13 10
Service cost - continuing operations 4 6
Service cost - discontinued operations 0 1
Postretirement benefits | Continuing Operations    
Non-operating expense    
Total non-operating expense (benefit) - continuing operations 9 3
Total net periodic benefit cost (benefit) - continuing operations 13 9
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 26 37
Non-operating expense    
Interest cost 108 160
Expected return on plan assets (142) (237)
Amortization of transition asset 0 0
Amortization of prior service benefit 0 (4)
Amortization of net actuarial loss 69 95
Total non-operating expense (benefit) 35 14
Total net periodic benefit cost (benefit) 61 51
Service cost - continuing operations 26 30
Service cost - discontinued operations 0 7
United States | U.S. Pension Plans | Continuing Operations    
Non-operating expense    
Total non-operating expense (benefit) - continuing operations 35 14
Total net periodic benefit cost (benefit) - continuing operations 61 44
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 11 21
Non-operating expense    
Interest cost 46 54
Expected return on plan assets (65) (87)
Amortization of transition asset 0 1
Amortization of prior service benefit 1 1
Amortization of net actuarial loss 2 3
Total non-operating expense (benefit) (16) (28)
Total net periodic benefit cost (benefit) (5) (7)
Service cost - continuing operations 11 16
Service cost - discontinued operations 0 5
International | U.S. Pension Plans | Continuing Operations    
Non-operating expense    
Total non-operating expense (benefit) - continuing operations (16) (28)
Total net periodic benefit cost (benefit) - continuing operations (5) (12)
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