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Other Financial Information Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other Financial Information [Abstract]    
Raw materials $ 1,860 $ 1,888
Work in process 267 235
Finished goods 501 507
Total 2,628 2,630
Inventories 898 814
Other long-term assets 1,730 1,816
Total $ 2,628 $ 2,630