Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Balances - February 1, 2011			$ 646,000,000
Currency translation adjustment			753,000,000
Net change in fair value of derivatives	65,000,000	(108,000,000)	(113,000,000)	(25,000,000)
Balances - July 31, 2011	1,286,000,000	(1,099,000,000)	1,286,000,000	(1,099,000,000)
Net translation gain (loss) related to net investment hedges	(1,400,000,000)		(1,400,000,000)
Accumulated comprehensive income (loss) to earnings from remeasurements of non U.S-denominated debt	111,000,000		111,000,000
Currency Translation And Other [Member]
Balances - February 1, 2011			1,226,000,000
Currency translation adjustment			753,000,000
Net change in fair value of derivatives
Balances - July 31, 2011	1,979,000,000		1,979,000,000
Derivative Instruments [Member]
Balances - February 1, 2011			60,000,000
Currency translation adjustment
Net change in fair value of derivatives			(113,000,000)
Balances - July 31, 2011	(53,000,000)		(53,000,000)
Minimum Pension Liability [Member]
Balances - February 1, 2011			(640,000,000)
Currency translation adjustment
Net change in fair value of derivatives
Balances - July 31, 2011	$ (640,000,000)		$ (640,000,000)