Other Financial Data - Other Liabilities (Details) - USD ($) $ in Millions	Sep. 28, 2019	Dec. 31, 2018
Other Liabilities [Abstract]
Defined benefit plans	$ 1,480	$ 1,557
Non-current contract liabilities	253	214
Unrecognized tax benefits	52	51
Deferred income taxes	172	201
Other	233	277
Other liabilities	$ 2,190	$ 2,300