Derivative Financial Instruments (Tables)

3 Months Ended

Apr. 30, 2013

Summary of Derivative Instruments [Abstract]

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

	April 30, 2013						January 31, 2013
(Amounts in millions)	Fair Value Instruments		Net Investment Instruments		Cash Flow Instruments		Fair Value Instruments		Net Investment Instruments		Cash Flow Instruments
Derivative instruments
Prepaid expenses and other	$	11	$	—	$	—	$	29	$	—	$	—
Other assets and deferred charges	12		236		241		31		223		327
Derivative asset subtotals	$	23	$	236	$	241	$	60	$	223	$	327
Accrued liabilities	$	—	$	—	$	2	$	—	$	—	$	4
Deferred income taxes and other	—		—		115		—		—		91
Derivative liability subtotals	$	—	$	—	$	117	$	—	$	—	$	95
Nonderivative hedging instruments
Long-term debt due within one year	$	—	$	767	$	—	$	—	$	818	$	—
Long-term debt	—		5,921		—		—		6,145		—
Nonderivative hedge liability subtotals	$	—	$	6,688	$	—	$	—	$	6,963	$	—