Intangible Assets And Goodwill (Amortized Intangible Assets, Excluding Goodwill, By Business Segment) (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2013	Dec. 31, 2012
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross Carrying Amount	$ 1,246	$ 1,251
Accumulated Amortization	1,148	1,142
Government [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross Carrying Amount	53	53
Accumulated Amortization	48	48
Enterprise [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Gross Carrying Amount	1,193	1,198
Accumulated Amortization	$ 1,100	$ 1,094