Discontinued Operations (Schedule of Major Class of Asset and Liabilities Included in Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 20	$ 1,383
Total current liabilities	5	657
SAIC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		1
Receivables, net		717
Inventory, prepaid expenses and other current assets		101
Total current assets		819
Property, plant and equipment, net		29
Intangible assets, net		6
Goodwill	491	491
Deferred income taxes		2
Other assets		1
Total assets		1,348
Accounts payable and accrued liabilities		461
Accrued payroll and employee benefits		185
Notes payable and long-term debt		1
Total current liabilities		647
Non-current liabilities		0
Total liabilities		$ 647