Retirement-Related Benefits - Contributions (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Retirement-Related Benefits | ||
| Contributions by employer - Noncash | $ 156 | $ 129 |
| Total plan contributions | 154 | 170 |
| U.S. and Non-U.S. nonpension postretirement benefit plans | ||
| Retirement-Related Benefits | ||
| Total plan contributions | 120 | 106 |
| Non-U.S. DB plans and multi-employer plans | ||
| Retirement-Related Benefits | ||
| Total plan contributions | 35 | 64 |
| Nonpension Postretirement Plans | Non-U.S. DB plans | ||
| Retirement-Related Benefits | ||
| Contributions by employer - Noncash | $ 105 | $ 150 |