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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Inventory, Net [Abstract]          
Inventory valuation reserves $ 413   $ 413   $ 360
Finished goods 2,656   2,656   2,577
Work in process and raw material 2,019   2,019   1,930
Total inventories, net 4,675   4,675   $ 4,507
Inventory impairment $ 15 $ 4 $ 76 $ 19