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Fair Value Measurements (Tables)
 12 Months Ended
Jan. 31, 2016
Fair Value Disclosures [Abstract]  
Notional amounts and fair values of derivatives
As of January 31, 2016 and 2015, the notional amounts and fair values of these derivatives were as follows:
 
January 31, 2016
 
January 31, 2015
(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
$
5,000

 
$
173

 
$
500

 
$
12

Receive fixed-rate, pay fixed-rate cross-currency swaps designated as net investment hedges
1,250

 
319

 
1,250

 
207

Receive fixed-rate, pay fixed-rate cross-currency swaps designated as cash flow hedges
4,132

 
(609
)
 
4,329

 
(317
)
Receive variable-rate, pay fixed-rate interest rate swaps designated as cash flow hedges
—

 
—

 
255

 
(1
)
Total
$
10,382

 
$
(117
)
 
$
6,334

 
$
(99
)
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, 2016 and 2015, are as follows: 
 
 
January 31, 2016
 
January 31, 2015
(Amounts in millions)
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including amounts due within one year
 
$
40,959

 
$
46,965

 
$
45,896

 
$
56,237