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Accumulated other Comprehensive Income (Tables)
 12 Months Ended
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
fiscal years ended March 31, 2019, 2018 and 2017 are as follows (in millions):
 
Unrealized Net Gains (Losses) on Available-for-Sale Securities
 
Unrealized Net Gains (Losses) on Derivative Instruments
 
Foreign Currency Translation Adjustments
 
Total
Balances as of March 31, 2016
$
1

 
$
14

 
$
(31
)
 
$
(16
)
Other comprehensive income (loss) before reclassifications
(3
)
 
54

 
(17
)
 
34

Amounts reclassified from accumulated other comprehensive income (loss)
(1
)
 
(36
)
 
—

 
(37
)
Total other comprehensive income (loss), net of tax
(4
)
 
18

 
(17
)
 
(3
)
Balances as of March 31, 2017
$
(3
)
 
$
32

 
$
(48
)
 
$
(19
)
Other comprehensive income (loss) before reclassifications
(9
)
 
(126
)
 
28

 
(107
)
Amounts reclassified from accumulated other comprehensive income (loss)
4

 
5

 
(10
)
 
(1
)
Total other comprehensive income (loss), net of tax
(5
)
 
(121
)
 
18

 
(108
)
Balances as of March 31, 2018
$
(8
)
 
$
(89
)
 
$
(30
)
 
$
(127
)
Cumulative-effect adjustment from the adoption of ASC 606
—

 
22

 
—

 
22

Cumulative-effect adjustment from the adoption of ASU 2018-02
—

 
1

 
—

 
1

Balances as of April 1, 2018
$
(8
)
 
$
(66
)
 
$
(30
)
 
$
(104
)
Other comprehensive income (loss) before reclassifications
6

 
96

 
(21
)
 
81

Amounts reclassified from accumulated other comprehensive income (loss)
1

 
(8
)
 
—

 
(7
)
Total other comprehensive income (loss), net of tax
7

 
88

 
(21
)
 
74

Balances as of March 31, 2019
$
(1
)
 
$
22

 
$
(51
)
 
$
(30
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the fiscal years ended March 31, 2019, 2018 and 2017 were as follows (in millions):
 Statement of Operations Classification
 
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)
Year Ended March 31,
2019
 
2018
 
2017
(Gains) losses on available-for-sale securities:
 
 
 
 
 
 
Interest and other income (expense), net
 
$
1

 
$
4

 
$
(1
)
Total, net of tax
 
1

 
4

 
(1
)
 
 
 
 
 
 
 
(Gains) losses on cash flow hedges from forward contracts:
 
 
 
 
 
 
Net revenue
 
(18
)
 
10

 
(37
)
Research and development
 
10

 
(5
)
 
1

Total, net of tax
 
(8
)
 
5

 
(36
)
 
 
 
 
 
 
 
(Gains) losses on foreign currency translation:
 
 
 
 
 
 
Interest and other income (expense), net
 
—

 
(10
)
 
—

Total, net of tax
 
—

 
(10
)
 
—

 
 
 
 
 
 
 
Total net (gain) loss reclassified, net of tax
 
$
(7
)
 
$
(1
)
 
$
(37
)