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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jul. 31, 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 six months ended July 31, 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)
 
1,898

 
1,208

 
(149
)
 
128

 
3

 
3,088

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

 
—

 
—

 
15

 
29

 
44

Balances as of July 31, 2017
 
$
(12,609
)
 
$
1,353

 
$
1,286

 
$
(172
)
 
$
(958
)
 
$
(11,100
)
(1) Income tax impact is immaterial.