Revenue (Details) $ / shares in Units, contract in Thousands, $ in Millions	3 Months Ended		12 Months Ended
	Apr. 02, 2017 USD ($) contract $ / shares	Apr. 03, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating earnings	$ 1,035	$ 924
Diluted | $ / shares	$ 2.48	$ 2.04
Unbilled revenue	$ 25,979		$ 25,543
Number of active contracts | contract	10
Revenue recognized in contract liability balance	$ 1,700	$ 1,400
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating earnings	$ 50	$ 58
Diluted | $ / shares	$ 0.11	$ 0.12
Unbilled revenue	$ 72	$ 68
Transferred over Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Percentage from Products and Services Transferred to Customers	70.00%	73.00%
Transferred at Point in Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Percentage from Products and Services Transferred to Customers	30.00%	27.00%