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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended June 30, 2019 and 2018 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, 2019
$
(1
)
 
$
22

 
$
(51
)
 
$
(30
)
Other comprehensive income (loss) before reclassifications
3

 
19

 
1

 
23

Amounts reclassified from accumulated other comprehensive income (loss)
—

 
(10
)
 
—

 
(10
)
Total other comprehensive income (loss), net of tax

3

 
9

 
1

 
13

Balances as of June 30, 2019
$
2

 
$
31

 
$
(50
)
 
$
(17
)
 
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, 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
—

 
78

 
(15
)
 
63

Amounts reclassified from accumulated other comprehensive income (loss)
—

 
15

 
—

 
15

Total other comprehensive income (loss), net of tax

—

 
93

 
(15
)
 
78

Balances as of June 30, 2018
$
(8
)
 
$
27

 
$
(45
)
 
$
(26
)
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The effects on net income of amounts reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2019 and 2018 were as follows (in millions):
 

Amount Reclassified From Accumulated Other Comprehensive Income (Loss)
Statement of Operations Classification

Three Months Ended
June 30, 2019

Three Months Ended
June 30, 2018
(Gains) losses on foreign currency forward contracts designated as cash flow hedges
 
 
 
 
Net revenue

$
(16
)

$
14

Research and development

6


1

Total net (gain) loss reclassified, net of tax
 
$
(10
)
 
$
15