v3.25.2
Retirement-Related Benefits - Cost of Retirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Cost/(Income) of Pension Plans        
Total defined benefit pension and defined contribution plans cost recognized in the Consolidated Income Statement $ 248 $ 320 $ 482 $ 643
U.S. Plans | Pension Plan        
Cost/(Income) of Pension Plans        
Service cost 88 98 176 197
Interest cost 187 254 374 508
Expected return on plan assets (268) (340) (536) (681)
Amortization of prior service costs/(credits) 0 0 0 0
Recognized actuarial losses 70 129 140 257
Curtailments and settlements 0 0 0 0
Multi-employer plans 0 0 0 0
Other costs/(credits) 0 0 0 0
Total net periodic pension (income)/cost of defined benefit plans 77 140 154 280
Cost of defined contribution plans 17 15 30 27
Total defined benefit pension and defined contribution plans cost recognized in the Consolidated Income Statement 93 155 184 307
U.S. Plans | Other Postretirement Benefits Plan        
Cost/(Income) of Pension Plans        
Service cost 0 1 1 1
Interest cost 28 27 57 53
Expected return on plan assets 0 0 0 0
Amortization of prior service costs/(credits) (7) (7) (15) (15)
Recognized actuarial losses 0 0 0 0
Curtailments and settlements 0 0 0 0
Total net periodic pension (income)/cost of defined benefit plans 22 20 43 40
Non-U.S. Plans | Pension Plan        
Cost/(Income) of Pension Plans        
Service cost 44 41 85 85
Interest cost 267 264 518 532
Expected return on plan assets (369) (384) (715) (773)
Amortization of prior service costs/(credits) 6 5 11 11
Recognized actuarial losses 87 128 169 258
Curtailments and settlements 5 2 7 4
Multi-employer plans 3 3 6 6
Other costs/(credits) 10 12 18 20
Total net periodic pension (income)/cost of defined benefit plans 52 71 99 143
Cost of defined contribution plans 103 94 199 193
Total defined benefit pension and defined contribution plans cost recognized in the Consolidated Income Statement 155 165 298 336
Non-U.S. Plans | Other Postretirement Benefits Plan        
Cost/(Income) of Pension Plans        
Service cost 0 1 1 1
Interest cost 10 10 21 21
Expected return on plan assets 0 0 (1) (1)
Amortization of prior service costs/(credits) 0 0 0 0
Recognized actuarial losses 0 0 0 0
Curtailments and settlements 0 0 0 0
Total net periodic pension (income)/cost of defined benefit plans $ 11 $ 10 $ 22 $ 21