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Retirement-Related Benefits - ABO and APBO in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Pension Plans    
Defined Benefit Plan, Pension and Non-Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets    
Plans with PBO in excess of plan assets, Benefit Obligation $ 31,714 $ 30,059
Plans with PBO in excess of plan assets, Plan Assets 18,398 16,783
Plans with ABO in excess of plan assets, Benefit Obligation 30,882 29,312
Plans with ABO in excess of plan assets, Plan Assets 18,127 16,522
Plans with assets in excess of PBO, Benefit Obligation 66,842 63,524
Plans with assets in excess of PBO, Plan Assets 73,705 68,190
Nonpension Postretirement Plans    
Defined Benefit Plan, Pension and Non-Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets    
Plans with APBO in excess of plan assets, Benefit Obligation 4,685 4,616
Plans with APBO in excess of plan assets, Plan Assets 47 $ 94
Plans with plan assets in excess of APBO, Benefit Obligation 19  
Plans with plan assets in excess of APBO, Plan Assets $ 21