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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss)
The following table summarizes the change in the components of accumulated other comprehensive loss net of tax and "Noncontrolling interests", for the periods presented (in millions).

 
 
(A)
Currency Translation
 
 
(B)
Cash Flow Hedges
 
(C)
Postretirement Benefit Plans
 
Total
Balance as of March 31, 2012
 
$
20

 
$
(7
)
 
$
(204
)
 
$
(191
)
Other comprehensive income before reclassifications
 
(42
)
 
11

 
(49
)
 
(80
)
Amounts reclassified from AOCI, net
 
(11
)
 
(6
)
 
20

 
3

Net current-period other comprehensive income (loss)
 
(53
)
 
5

 
(29
)
 
(77
)
Balance as of March 31, 2013
 
(33
)
 
(2
)
 
(233
)
 
(268
)
Other comprehensive income before reclassifications
 
122

 
7

 
64

 
193

Amounts reclassified from AOCI, net
 
—

 
(25
)
 
9

 
(16
)
Net current-period other comprehensive income (loss)
 
122

 
(18
)
 
73

 
177

Balance as of March 31, 2014
 
89

 
(20
)
 
(160
)
 
(91
)
Other comprehensive income before reclassifications
 
(302
)
 
(74
)
 
(118
)
 
(494
)
Amounts reclassified from AOCI, net
 
—

 
31

 
(7
)
 
24

Net current-period other comprehensive (loss) income
 
(302
)
 
(43
)
 
(125
)
 
(470
)
Balance as of March 31, 2015
 
$
(213
)
 
$
(63
)
 
$
(285
)
 
$
(561
)
  
(A)  We reclassified $11 million of cumulative currency gains from AOCI to "Gain on assets held for sale" in the year ended March 31, 2013, related to the sale of three aluminum foil and packaging plants in Europe.
(B)
For additional information on our cash flow hedges see Note 15 - Financial Instruments and Commodity Contracts.
(C)
For additional information on our postretirement benefit plans see Note 13 - Postretirement Benefit Plans.