Derivative Financial Instruments (Tables)

9 Months Ended

Oct. 31, 2011

Derivative Financial Instruments [Abstract]

Balance Sheet Classification Of Financial Instruments

	October 31, 2011						January 31, 2011
(Amounts in millions)	Fair  Value Instruments		Net  Investment Instruments		Cash  Flow Instruments		Fair  Value Instruments		Net  Investment Instruments		Cash  Flow Instruments
Balance Sheet Classification:
Prepaid expenses and other	$	3	$	—	$	—	$	—	$	—	$	—
Other assets and deferred charges		210		291		105		267		233		238
Asset subtotals	$	213	$	291	$	105	$	267	$	233	$	238
Long-term debt due within one year	$	3	$	—	$	—	$	—	$	—	$	—
Long-term debt		210		—		—		267		—		—
Deferred income taxes and other		—		—		81		—		—		18
Liability subtotals	$	213	$	—	$	81	$	267	$	—	$	18