Debt (Details 2) (USD $) In Millions, unless otherwise specified	May 05, 2012	Mar. 03, 2012	Apr. 30, 2011
Long-term Debt.
Total long-term debt	$ 1,721	$ 1,728	$ 2,146
Less: current portion	(43)	(43)	(442)
Total long-term debt, less current portion	1,678	1,685	1,704
Long-term debt, fair value	1,699	1,756	2,225
2013 Notes [Member]
Long-term Debt.
Total long-term debt	500	500	500
2016 Notes [Member]
Long-term Debt.
Total long-term debt	349	349	349
2021 Notes [Member]
Long-term Debt.
Total long-term debt	648	648	648
Convertible debentures [Member]
Long-term Debt.
Total long-term debt	0	0	402
Financing Lease Obligations [Member]
Long-term Debt.
Total long-term debt	145	149	168
Capital Lease Obligations [Member]
Long-term Debt.
Total long-term debt	78	81	77
Other debt [Member]
Long-term Debt.
Total long-term debt	$ 1	$ 1	$ 2