Fair Value Measurements (Tables)

9 Months Ended

Oct. 31, 2011

Fair Value Measurements [Abstract]

Carrying Value And Fair Value Of Long-Term Debt

	October 31, 2011				January 31, 2011
(Amounts in millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt, including amounts due within one year	$	46,342	$	52,681	$	45,347	$	47,012

Notional Amounts And Fair Values Of Interest Rate Swaps

	October 31, 2011					January 31, 2011
(Amounts in millions)	Notional Amount		Fair Value			Notional Amount		Fair Value
Receive fixed-rate, pay floating-rate interest rate swaps designated as fair value hedges	$	3,945	$	213		$	4,445	$	267
Receive fixed-rate, pay fixed-rate cross-currency interest rate swaps designated as net investment hedges		1,250		291			1,250		233
Receive floating-rate, pay fixed-rate interest rate swaps designated as cash flow hedges		1,240		(17	)		1,182		(18	)
Receive fixed-rate, pay fixed-rate cross-currency interest rate swaps designated as cash flow hedges		2,994		41			2,902		238
Total	$	9,429	$	528		$	9,779	$	720