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Research, Development & Engineering (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Research, Development & Engineering      
RD&E expense $ 5,989 $ 5,379 $ 5,590
Scientific research, application of scientific advances, services and application 5,657 5,027 5,170
Software-related expenses 3,541 3,050 3,145
Product-related engineering expenses $ 334 $ 352 $ 420