Retirement-Related Benefits - All Retirement Plans Cost (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Retirement-Related Benefits | ||
| Defined benefit and contribution pension plans - cost | $ 478 | $ 619 |
| Nonpension postretirement plans - cost | 33 | 44 |
| Total | $ 510 | $ 663 |
| Year-to-year percent change, defined benefit and contribution pension plans cost (as a percent) | (22.80%) | |
| Year-to-year percent change, nonpension postretirement plans cost (as a percent) | (25.00%) | |
| Year-to-year percent change, total (as a percent) | (23.00%) | |