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Summary of Significant Accounting Policies (Restructuring Reserve) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 31, 2014
Restructuring Reserve [Roll Forward]
Beginng balance	$ 21
Charges	1
Cash payments	(12)
Ending balance	10
Employee Severance
Restructuring Reserve [Roll Forward]
Beginng balance	1
Charges	0
Cash payments	(1)
Ending balance	0
Facility Closing
Restructuring Reserve [Roll Forward]
Beginng balance	20
Charges	1
Cash payments	(11)
Ending balance	$ 10

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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