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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Apr. 30, 2016
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, 2016:
(Amounts in millions and net of income taxes)
 
Currency Translation
and Other
 
Net Investment Hedges
 
Cash Flow Hedges
 
Minimum
Pension Liability
 
Total
Balances as of February 1, 2016
 
$
(11,690
)
 
$
1,022

 
$
(336
)
 
$
(593
)
 
$
(11,597
)
Other comprehensive income (loss) before reclassifications
 
636

 
(78
)
 
139

 
(97
)
 
600

Amounts reclassified from accumulated other comprehensive loss
 
—

 
—

 
4

 
(2
)
 
2

Balances as of April 30, 2016
 
$
(11,054
)
 
$
944

 
$
(193
)
 
$
(692
)
 
$
(10,995
)