Other Financial Information Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Other Financial Information [Abstract]
Raw materials	$ 1,061	$ 1,348
Work in process	182	170
Finished goods	710	549
Total	1,953	2,067
Inventories	1,008	922
Other long-term assets	$ 945	$ 1,145