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Supplemental Financial Information - Post-employment obligations and other long-term liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Post-employment Obligations and Other Long-term Liabilities:      
Defined benefit pension plans and post-employment medical and dental plans for significant plans $ 3,119 $ 2,817  
Deferred income taxes 1,406 1,546  
Operating lease liabilities 902 755  
All other 3,684 3,944  
Total 9,111 9,062  
All other disclosures      
Net unrecognized tax benefits from acquisition 1,210 1,175 $ 1,120
All other      
All other disclosures      
Net unrecognized tax benefits from acquisition $ 740 $ 580