Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Net income	$ 145	$ 139	$ 605	$ 511
Other comprehensive income (loss), before tax:
Post employment and postretirement benefit plans, before tax	37	22	115	66
Marketable securities, before tax	0	0	0	(15)
Total other comprehensive income, before tax	37	22	115	51
Tax effect related to items of other comprehensive income	(13)	(8)	(44)	(20)
Total other comprehensive income, net of tax effect	24	14	71	31
Comprehensive income	$ 169	$ 153	$ 676	$ 542