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

 
$
172

 
$
5,000

 
$
173

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

 
532

 
1,250

 
319

Receive fixed-rate, pay fixed-rate cross-currency swaps designated as cash flow hedges
3,970

 
(837
)
 
4,132

 
(609
)
Total
$
10,220

 
$
(133
)
 
$
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 October 31, 2016 and January 31, 2016, are as follows: 
 
 
October 31, 2016
 
January 31, 2016
(Amounts in millions)
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including amounts due within one year
 
$
38,444

 
$
46,797

 
$
40,959

 
$
46,965