Income and Other Taxes, Unrecognized Tax Benefit Reconciliation (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 03, 2012	Jan. 28, 2011	Jan. 29, 2010
Unrecognized Tax Benefits
Balance at period start	$ 1,983	$ 1,793	$ 1,538
Increases related to tax positions of the current year	260	262	298
Increases related to tax positions of prior years	30	22	32
Reductions for tax positions of prior years	(43)	(41)	(69)
Lapse of statute of limitations	(32)	(32)	(3)
Audit settlements	(4)	(21)	(3)
Balance at period end	$ 2,194	$ 1,983	$ 1,793