Retirement-Related Benefits - Contributions and Direct Benefit Payments (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Retirement-Related Benefits. | ||
| Total | $ 1,962 | $ 2,085 |
| Non-U.S. DB plans | ||
| Retirement-Related Benefits. | ||
| Total | 103 | 86 |
| Multi-employer plans | ||
| Retirement-Related Benefits. | ||
| Total | 15 | 17 |
| DC plans | ||
| Retirement-Related Benefits. | ||
| Total | 924 | 992 |
| Direct Benefit Payments | ||
| Retirement-Related Benefits. | ||
| Total | 576 | 671 |
| Nonpension Postretirement Plans | ||
| Retirement-Related Benefits. | ||
| Total | 344 | 319 |
| Nonpension Postretirement Plans | Non-U.S. DB plans | ||
| Retirement-Related Benefits. | ||
| Contributions by employer - Noncash | $ 349 | $ 416 |