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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Jan. 31, 2018
Other Comprehensive Income (Loss), Tax [Abstract]  
Composition of accumulated other comprehensive income (loss)
The following table provides the changes in the composition of total accumulated other comprehensive loss for fiscal 2018, 2017 and 2016:
(Amounts in millions and net of income taxes)
Currency
Translation
and Other
 
Net Investment Hedges
 
Unrealized Gain on Available-for-Sale Securities
 
Cash Flow Hedges
 
Minimum
Pension Liability
 
Total
Balances as of February 1, 2015
$
(7,011
)
 
$
656

 
$
—

 
$
(134
)
 
$
(679
)
 
$
(7,168
)
Other comprehensive income (loss) before reclassifications, net
(4,679
)
 
366

 
—

 
(217
)
 
96

 
(4,434
)
Amounts reclassified from accumulated other comprehensive loss, net
—

 
—

 
—

 
15

 
(10
)
 
5

Balances as of January 31, 2016
(11,690
)
 
1,022

 
—

 
(336
)
 
(593
)
 
(11,597
)
Other comprehensive income (loss) before reclassifications, net
(2,817
)
 
413

 
145

 
(22
)
 
(389
)
 
(2,670
)
Amounts reclassified from accumulated other comprehensive loss, net
—

 
—

 
—

 
43

 
(8
)
 
35

Balances as of January 31, 2017
(14,507
)
 
1,435

 
145

 
(315
)
 
(990
)
 
(14,232
)
Other comprehensive income (loss) before reclassifications, net
2,345

 
(405
)
 
1,501

 
436

 
83

 
3,960

Amounts reclassified from accumulated other comprehensive loss, net
26

 
—

 
—

 
1

 
64

 
91

Balances as of January 31, 2018
$
(12,136
)
 
$
1,030

 
$
1,646

 
$
122

 
$
(843
)
 
$
(10,181
)