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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Apr. 30, 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 three months ended April 30, 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)
 
1,302

 
—

 
68

 
(86
)
 
32

 
1,316

Reclassifications to income, net(1)
 
—

 
—

 
—

 
9

 
11

 
20

Balances as of April 30, 2018
 
$
(10,745
)
 
$
—

 
$
1,191

 
$
73

 
$
(800
)
 
$
(10,281
)
(1) Income tax impact is immaterial
(2) Primarily relates to the adoption of ASU 2016-01 and ASU 2018-02