Summary of Significant Accounting Policies - Contracts Estimates (Details) - Cumulative catch-up method - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 04, 2020	Dec. 29, 2018	Dec. 30, 2017
Use of Estimates
Cumulative catch-up adjustments	$ 91	$ 196	$ 5
Change in accounting estimate financial effect increase in net income	$ 69	$ 149	$ 3
Change in Accounting Estimate Financial Effect Increase in Earnings Per Share Diluted	$ 0.30	$ 0.59	$ 0.01
Gross favorable adjustments	$ 173	$ 249	$ 92
Gross unfavorable adjustments	82	53	$ 87
Gross favorable adjustment related to Bell segment		145
Revenue recognized from performance obligations satisfied in prior periods	$ 97	$ 190