Other Financial Data (Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Deferred revenue	$ 819	$ 820
Billings in excess of costs and earnings	297	387
Compensation	329	424
Tax liabilities	75	95
Customer reserves	106	144
Dividend payable	71	72
Other	595	684
Accrued liabilities	$ 2,292	$ 2,626