Financing Activities (Detail Of Debt Repayments) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010
Short-term and Long-term Debt [Line Items]
Debt repaid	$ 451	$ 1,090
5.35% Senior Notes Due 2012 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	484
Debt instrument, interest rate	5.35%	5.35%
Debt instrument, maturity year	2012
8.0% Senior Debentures Due 2012 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	27
Debt instrument, interest rate	8.00%	8.00%
Debt instrument, maturity year	2012
5.875% Senior Notes Due 2013 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	52
Debt instrument, interest rate	5.875%	5.875%
Debt instrument, maturity year	2013
7.625% Senior Debentures Due 2013 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	16
Debt instrument, interest rate	7.625%	7.625%
Debt instrument, maturity year	2013
5.75% Senior Notes Due 2014 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	47
Debt instrument, interest rate	5.75%	5.75%
Debt instrument, maturity year	2014
7.875% Senior Notes Due 2015 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	38
Debt instrument, interest rate	7.875%	7.875%
Debt instrument, maturity year	2015
5.90% Senior Notes Due 2016 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	123
Debt instrument, interest rate	5.90%	5.90%
Debt instrument, maturity year	2016
7.45% Senior Debentures Due 2016 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	2
Debt instrument, interest rate	7.45%	7.45%
Debt instrument, maturity year	2016
9.5% Amortizing Debentures Due 2021 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	4	4
Debt instrument, interest rate	9.50%	9.50%
Debt instrument, maturity year	2021
9.75% Amortizing Debentures Due 2021 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	2	2
Debt instrument, interest rate	9.75%	9.75%
Debt instrument, maturity year	2021
Capital Leases And Other Obligations [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	6	8
8.5% Senior Notes Due 2010 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	0	76
Debt instrument, interest rate	8.50%	8.50%
Debt instrument, maturity year	2010
6.625% Senior Notes Due 2011 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	330	170
Debt instrument, interest rate	6.625%	6.625%
Debt instrument, maturity year	2011
7.45% Senior Debentures Due 2011 [Member]
Short-term and Long-term Debt [Line Items]
Debt repaid	$ 109	$ 41
Debt instrument, interest rate	7.45%	7.45%
Debt instrument, maturity year	2011