Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jul. 03, 2016	Jul. 05, 2015	Jul. 03, 2016	Jul. 05, 2015	Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Tax benefit		$ (290)	$ (309)	$ (601)	$ (602)
Increase (decrease) in net cash provided by operating activities	[1]			873	1,433
Increase (decrease) in net cash used by financing activities				$ (1,540)	(2,324)
Length of fiscal quarters, weeks				91 days
Net increase in operating earnings from the quarterly impact of revisions in contract		$ 83	$ 45	$ 187	$ 108
Net increase in operating earnings per share from the quarterly impact of revisions in contract		$ 0.17	$ 0.09	$ 0.39	$ 0.21
New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncement, Early Adoption [Line Items]
Tax benefit				$ 30
Increase (decrease) in net cash provided by operating activities				60	$ 85	$ 108
Increase (decrease) in net cash used by financing activities				$ (60)	$ (85)	$ (108)

[1] * Continuing operations only