Fair Value Measurements (Tables)

12 Months Ended

Jan. 31, 2015

Fair Value Disclosures [Abstract]

Notional amounts and fair values of derivatives

As of January 31, 2015 and 2014, the notional amounts and fair values of these derivatives were as follows:

	January 31, 2015					January 31, 2014
(Amounts in millions)	Notional Amount		Fair Value			Notional Amount		Fair Value
Receive fixed-rate, pay variable-rate interest rate swaps designated as fair value hedges	$	500	$	12		$	1,000	$	5
Receive fixed-rate, pay fixed-rate cross-currency interest rate swaps designated as net investment hedges	1,250		207			1,250		97
Receive fixed-rate, pay fixed-rate cross-currency interest rate swaps designated as cash flow hedges	4,329		(317		)	3,004		453
Receive variable-rate, pay fixed-rate interest rate swaps designated as cash flow hedges	255		(1		)	457		(2		)
Receive variable-rate, pay fixed-rate forward starting interest rate swaps designated as cash flow hedges	—		—			2,500		166
Total	$	6,334	$	(99	)	$	8,211	$	719

Carrying value and fair value of long-term debt

The carrying value and fair value of the Company's long-term debt as of January 31, 2015 and 2014, are as follows: 

	January 31, 2015				January 31, 2014
(Amounts in millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt, including amounts due within one year	$	45,896	$	56,237	$	45,874	$	50,757