Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Summary of Inventories
Raw materials and supplies	$ 1,202	$ 1,140
Goods in process	1,986	2,317
Finished goods	5,490	5,308
Total inventories	8,678	$ 8,765
LifeScan | Discontinued Operations, Held-for-sale or Disposed of by Sale
Summary of Inventories
Disposal group inventory	100
AdvancedSterilizationProducts | Discontinued Operations, Held-for-sale or Disposed of by Sale
Summary of Inventories
Disposal group inventory	200
Assets held for sale, current	200
Supply Chain | Discontinued Operations, Held-for-sale or Disposed of by Sale
Summary of Inventories
Assets held for sale, current	$ 300