Retirement-Related Benefits - Contributions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Retirement-Related Benefits
Total plan contributions	$ 357	$ 306
U.S. and Non-U.S. nonpension postretirement benefit plans
Retirement-Related Benefits
Total plan contributions	272	263
Non-U.S. DB plans and multi-employer plans
Retirement-Related Benefits
Total plan contributions	85	43
Pension Plans, Including Multi-employer Plans
Retirement-Related Benefits
Contributions by employer - Noncash	366	311
Nonpension Postretirement Plans | Non-U.S. DB plans
Retirement-Related Benefits
Contributions by employer - Noncash	$ 247	$ 307