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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Jan. 31, 2017
Other Comprehensive Income (Loss), Tax [Abstract]  
Composition of accumulated other comprehensive income (loss)
The following table provides changes in the composition of total accumulated other comprehensive loss for fiscal 2017, 2016 and 2015:
(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 January 31, 2014
$
(2,999
)
 
$
277

 
$
336

 
$
(610
)
 
$
(2,996
)
Other comprehensive income (loss) before reclassifications
(4,012
)
 
379

 
(496
)
 
(58
)
 
(4,187
)
Amounts reclassified from accumulated other comprehensive loss
—

 
—

 
26

 
(11
)
 
15

Balances as of January 31, 2015
(7,011
)
 
656

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

 
(217
)
 
96

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

 
—

 
15

 
(10
)
 
5

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

 
(336
)
 
(593
)
 
(11,597
)
Other comprehensive income (loss) before reclassifications
(2,672
)
 
413

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

 
—

 
43

 
(8
)
 
35

Balances as of January 31, 2017
$
(14,362
)
 
$
1,435

 
$
(315
)
 
$
(990
)
 
$
(14,232
)