Information By Segment and Geographic Region (Corporate Related Expenses And Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Business Segments Information Abstract
Assets	$ 12,679	[1]	$ 13,929	[1]	$ 25,577	[1]
Capital Expenditures	187		186		192
Depreciation Expense	179		165		150
Government
Business Segments Information Abstract
Assets	3,095		2,892		3,424
Capital Expenditures	132		159		172
Depreciation Expense	143		128		110
Enterprise
Business Segments Information Abstract
Assets	2,552		2,264		2,724
Capital Expenditures	55		27		20
Depreciation Expense	36		37		40
Aggregate Segment
Business Segments Information Abstract
Assets	5,647		5,156		6,148
Capital Expenditures	187		186		192
Depreciation Expense	179		165		150
Other
Business Segments Information Abstract
Assets	7,032		8,773		11,649
Aggregate Segment Including Other
Business Segments Information Abstract
Assets	12,679		13,929		17,797
Discontinued Operations
Business Segments Information Abstract
Assets	$ 0		$ 0		$ 7,780

[1] Assets in Other include primarily cash and cash equivalents, Sigma Fund, deferred income taxes, short-term investments, property, plant and equipment, investments, and the administrative headquarters of the Company.