Derivative Financial Instruments (Tables)

9 Months Ended

Oct. 31, 2012

Summary of Derivative Instruments [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

	October 31, 2012						January 31, 2012
(Amounts in millions)	Fair Value Instruments		Net Investment Instruments		Cash Flow Instruments		Fair Value Instruments		Net Investment Instruments		Cash Flow Instruments
Prepaid expenses and other	$	55	$	—	$	—	$	2	$	—	$	—
Other assets and deferred charges	37		234		248		181		316		91
Asset subtotals	$	92	$	234	$	248	$	183	$	316	$	91
Long-term debt due within one year (hedged item)	$	55	$	—	$	—	$	2	$	—	$	—
Long-term debt (hedged item)	37		—		—		181		—		—
Accrued liabilities	—		—		7		—		—		—
Deferred income taxes and other	—		—		444		—		—		110
Liability subtotals	$	92	$	—	$	451	$	183	$	—	$	110

(Amounts in millions)	October 31, 2012		January 31, 2012
Long-term debt due within one year	$	1,744	$	785
Long-term debt	6,540		7,546
Liability subtotals	$	8,284	$	8,331