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Fair Value Measurements (Tables)
 12 Months Ended
Jan. 31, 2017
Fair Value Disclosures [Abstract]  
Notional amounts and fair values of derivatives
As of January 31, 2017 and 2016, the notional amounts and fair values of these derivatives were as follows:
 
January 31, 2017
 
January 31, 2016
(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

 
$
(4
)
 
$
5,000

 
$
173

Receive fixed-rate, pay fixed-rate cross-currency swaps designated as net investment hedges
2,250

 
471

 
1,250

 
319

Receive fixed-rate, pay fixed-rate cross-currency swaps designated as cash flow hedges
3,957

 
(618
)
 
4,132

 
(609
)
Total
$
11,207

 
$
(151
)
 
$
10,382

 
$
(117
)
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, 2017 and 2016, are as follows: 
 
 
January 31, 2017
 
January 31, 2016
(Amounts in millions)
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including amounts due within one year
 
$
38,271

 
$
44,602

 
$
40,959

 
$
46,965