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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jul. 31, 2018
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, 2018:
(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, 2018
 
$
(12,136
)
 
$
1,646

 
$
1,030

 
$
122

 
$
(843
)
 
$
(10,181
)
Adoption of new accounting standards on February 1, 2018(1) (2)
 
89

 
(1,646
)
 
93

 
28

 
—

 
(1,436
)
Other comprehensive income (loss) before reclassifications, net(1)
 
(1,093
)
 
—

 
261

 
(257
)
 
29

 
(1,060
)
Reclassifications to income, net(1)
 
—

 
—

 
—

 
25

 
23

 
48

Balances as of July 31, 2018
 
$
(13,140
)
 
$
—

 
$
1,384

 
$
(82
)
 
$
(791
)
 
$
(12,629
)
(1) Income tax impact is immaterial
(2) Primarily relates to the adoption of ASU 2016-01 and ASU 2018-02