Intangible Assets and Goodwill (Amortized Intangible Assets, Excluding Goodwill, By Business Segment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,254	$ 1,251
Accumulated Amortization	1,167	1,142
Government
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	55	53
Accumulated Amortization	48	48
Enterprise
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,199	1,198
Accumulated Amortization	$ 1,119	$ 1,094