Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings	$ 38,453		$ 39,115
Contract Balance
Current deferred income balances	519		$ 513
Net Sales	$ 8,278
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	$ 280