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Retirement-Related Benefits - Contributions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Retirement-Related Benefits        
Employer contributions $ 80 $ 66 $ 392 $ 421
Pension Plans, including Multi-employer Plans, and Nonpension Postretirement Benefits Plans        
Retirement-Related Benefits        
Contributions by employer - Noncash 65 65 475 421
U.S.        
Retirement-Related Benefits        
Employer contributions 65 35 265 262
Non-U.S.        
Retirement-Related Benefits        
Employer contributions $ 16 $ 32 $ 127 $ 159