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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Apr. 30, 2017
Other Comprehensive Income (Loss), Tax [Abstract]  
Composition of accumulated other comprehensive loss
The following table provides the changes in the composition of total accumulated other comprehensive loss for the three months ended April 30, 2017:
(Amounts in millions and net of income taxes)
 
Currency 
Translation and Other
 
Unrealized Gain on Available-for-Sale Securities

 
Net Investment Hedges
 
Cash Flow Hedges
 
Minimum
Pension 
Liability
 
Total
Balances as of February 1, 2017
 
$
(14,507
)
 
$
145

 
$
1,435

 
$
(315
)
 
$
(990
)
 
$
(14,232
)
Other comprehensive income (loss) before reclassifications, net(1)
 
877

 
481

 
(113
)
 
21

 
7

 
1,273

Amounts reclassified from accumulated other comprehensive loss, net(1)
 
—

 
—

 
—

 
7

 
(2
)
 
5

Balances as of April 30, 2017
 
$
(13,630
)
 
$
626

 
$
1,322

 
$
(287
)
 
$
(985
)
 
$
(12,954
)
(1) Tax impact is immaterial.