v3.26.1
Pension and Postretirement Benefit Plans - Schedule of Net Periodic Benefit Cost (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Non-operating expense        
Total net periodic benefit cost (benefit) $ (3) $ 23 $ (5) $ 51
Postretirement benefits        
Operating expense        
Service cost 5 5 9 9
Non-operating expense        
Interest cost 16 19 32 38
Expected return on plan assets (13) (14) (27) (28)
Amortization of prior service benefit (7) (3) (14) (4)
Amortization of net actuarial loss 4 3 8 8
Total non-operating expense (benefit) 0 5 (1) 14
Total net periodic benefit cost (benefit) 5 10 8 23
United States | Pension Plan        
Operating expense        
Service cost 25 25 49 51
Non-operating expense        
Interest cost 100 109 200 217
Expected return on plan assets (144) (142) (288) (284)
Amortization of prior service benefit 0 0 0 0
Amortization of net actuarial loss 63 69 127 138
Total non-operating expense (benefit) 19 36 39 71
Total net periodic benefit cost (benefit) 44 61 88 122
International | Pension Plan        
Operating expense        
Service cost 9 13 20 24
Non-operating expense        
Interest cost 50 46 100 92
Expected return on plan assets (74) (66) (147) (131)
Amortization of prior service benefit 0 0 0 1
Amortization of net actuarial loss 2 2 4 4
Total non-operating expense (benefit) (22) (18) (43) (34)
Total net periodic benefit cost (benefit) $ (13) $ (5) $ (23) $ (10)