Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013 item	Dec. 29, 2012	Dec. 31, 2011
Significant accounting policies
Number of borrowing groups	2
Number of employees under collaborative arrangement	0
Assets under collaborative arrangement	$ 0
Gross favorable program profit adjustments	51	88	83
Gross unfavorable program profit adjustments	22	73	29
Period of customization services	6 months
Collaborative arrangement profit sharing percentage allocation on cost-plus contracts	50.00%
Collaborative arrangement negotiated profit sharing percentage allocation on fixed-price contracts	50.00%
Gross intangible assets amortized based on the cash flow streams	64.00%
Environmental Liabilities and Asset Retirement Obligations
Asset retirement obligations	0
Period for warranty and product maintenance programs, minimum	1 year
Period for warranty and product maintenance programs, maximum	5 years
Research and development costs	651	584	525
Contracts accounted for under percentage of completion method
Change in accounting estimate
Income from continuing operations before income taxes	29	15	54
Change in Accounting Estimate Financial Effect Increase in Income from Continuing Operations after taxes	$ 18	$ 9	$ 34
Income from continuing operations per diluted share	$ 0.06	$ 0.03	$ 0.11