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Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings	$ 39,442	$ 39,442		$ 39,115
Contract Balance
Current deferred income balances	512	512		$ 513
Net Sales	8,390	$ 16,668
Exemptions and Practical Expedients Applied or Elected
Practical Expedient, unfulfilled performance obligation		true
Practical Expedient, relative to costs of obtaining a contract		true
Difference between Revenue Guidance in Effect before and after Topic 606 \| Maximum
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings			$ 2
ASU 2014-09 Revenue from Contracts with Customers \| Difference between Revenue Guidance in Effect before and after Topic 606
Contract Balance
Net Sales	$ 110	$ 390