Other Financial Data (Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Deferred revenue	$ 778	$ 820
Compensation	334	424
Billings in excess of costs and earnings	295	387
Tax liabilities	95	95
Customer reserves	146	144
Dividend payable	79	72
Other	675	684
Accrued liabilities	$ 2,402	$ 2,626