v3.26.3
Pension and Postretirement Benefit Plans - Schedule of Net Periodic Benefit Cost (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Non-operating expense        
Total net periodic benefit cost (benefit) $ (2) $ 20 $ (7) $ 71
Postretirement benefits        
Operating expense        
Service cost 3 5 12 14
Non-operating expense        
Interest cost 16 18 48 56
Expected return on plan assets (13) (14) (40) (42)
Amortization of prior service benefit (7) (4) (21) (8)
Amortization of net actuarial loss 4 4 12 12
Total non-operating expense (benefit) 0 4 (1) 18
Total net periodic benefit cost (benefit) 3 9 11 32
United States | Pension Plan        
Operating expense        
Service cost 24 26 73 77
Non-operating expense        
Interest cost 99 108 299 325
Expected return on plan assets (144) (142) (432) (426)
Amortization of prior service benefit 0 0 0 0
Amortization of net actuarial loss 63 69 190 207
Total non-operating expense (benefit) 18 35 57 106
Total net periodic benefit cost (benefit) 42 61 130 183
International | Pension Plan        
Operating expense        
Service cost 11 12 31 36
Non-operating expense        
Interest cost 49 46 149 138
Expected return on plan assets (73) (67) (220) (198)
Amortization of prior service benefit 1 0 1 1
Amortization of net actuarial loss 3 2 7 6
Total non-operating expense (benefit) (20) (19) (63) (53)
Total net periodic benefit cost (benefit) $ (9) $ (7) $ (32) $ (17)