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Income Taxes (Tables)
 12 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]  
Components Of Income Before Provision For (Benefit From) Income Taxes
The components of our income before provision for (benefit from) income taxes for the fiscal years ended March 31, 2017, 2016 and 2015 are as follows (in millions): 
 
Year Ended March 31,
 
2017
 
2016
 
2015
Domestic
$
382

 
$
133

 
$
232

Foreign
828

 
744

 
693

Income before provision for (benefit from) income taxes
$
1,210

 
$
877

 
$
925
Provision For (Benefit From) Income Taxes
Provision for (benefit from) income taxes for the fiscal years ended March 31, 2017, 2016 and 2015 consisted of (in millions):
 
Current
 
Deferred
 
Total
Year Ended March 31, 2017
 
 
 
 
 
Federal
$
86

 
$
96

 
$
182

State
3

 
9

 
12

Foreign
51

 
(2
)
 
49

 
$
140

 
$
103

 
$
243

Year Ended March 31, 2016
 
 
 
 
 
Federal
$
69

 
$
(376
)
 
$
(307
)
State
5

 
(14
)
 
(9
)
Foreign
36

 
1

 
37

 
$
110

 
$
(389
)
 
$
(279
)
Year Ended March 31, 2015
 
 
 
 
 
Federal
$
10

 
$
17

 
$
27

State
—

 
—

 
—

Foreign
21

 
2

 
23

 
$
31

 
$
19

 
$
50
Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate
The differences between the statutory tax expense rate and our effective tax expense (benefit) rate, expressed as a percentage of income before provision for (benefit from) income taxes, for the fiscal years ended March 31, 2017, 2016 and 2015 were as follows: 
 
Year Ended March 31,
 
2017
 
2016
 
2015
Statutory federal tax expense rate
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes, net of federal benefit
1.0
 %
 
0.5
 %
 
0.1
 %
Differences between statutory rate and foreign effective tax rate
(19.3
)%
 
(22.1
)%
 
(22.3
)%
Valuation allowance
—
 %
 
(51.7
)%
 
(9.2
)%
Research and development credits
(0.7
)%
 
(0.6
)%
 
(1.1
)%
Unremitted earnings of foreign subsidiaries
2.2
 %
 
4.9
 %
 
—
 %
Non-deductible stock-based compensation
2.3
 %
 
3.1
 %
 
3.5
 %
Other
(0.4
)%
 
(0.9
)%
 
(0.6
)%
Effective tax expense (benefit) rate
20.1
 %
 
(31.8
)%
 
5.4
 %
Deferred Tax Assets And Liabilities
The components of net deferred tax assets, as of March 31, 2017 and 2016 consisted of (in millions): 
 
As of March 31,
 
2017
 
2016
Deferred tax assets:
 
 
 
Accruals, reserves and other expenses
$
151

 
$
171

Tax credit carryforwards
276

 
334

Stock-based compensation
37

 
39

Net operating loss & capital loss carryforwards
25

 
28

Total
489

 
572

Valuation allowance
(114
)
 
(114
)
Deferred tax assets, net of valuation allowance
375

 
458

Deferred tax liabilities:
 
 
 
Amortization and depreciation
(19
)
 
(27
)
Unremitted earnings of foreign subsidiaries
(70
)
 
(43
)
Prepaids and other liabilities
(1
)
 
(3
)
Total
(90
)
 
(73
)
Deferred tax assets, net of valuation allowance and deferred tax liabilities
$
285

 
$
385
Schedule Of Unrecognized Tax Benefits
A reconciliation of the beginning and ending balance of unrecognized tax benefits is summarized as follows (in millions): 
Balance as of March 31, 2014
$
232

Increases in unrecognized tax benefits related to prior year tax positions
9

Decreases in unrecognized tax benefits related to prior year tax positions
(14
)
Increases in unrecognized tax benefits related to current year tax positions
50

Decreases in unrecognized tax benefits related to settlements with taxing authorities
(6
)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations
(7
)
Changes in unrecognized tax benefits due to foreign currency translation
(10
)
Balance as of March 31, 2015
254

Increases in unrecognized tax benefits related to prior year tax positions
33

Decreases in unrecognized tax benefits related to prior year tax positions
(4
)
Increases in unrecognized tax benefits related to current year tax positions
63

Decreases in unrecognized tax benefits related to settlements with taxing authorities
(10
)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations
(4
)
Changes in unrecognized tax benefits due to foreign currency translation
(1
)
Balance as of March 31, 2016
331

Increases in unrecognized tax benefits related to prior year tax positions
3

Decreases in unrecognized tax benefits related to prior year tax positions
(3
)
Increases in unrecognized tax benefits related to current year tax positions
64

Decreases in unrecognized tax benefits related to settlements with taxing authorities
—

Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations
(3
)
Changes in unrecognized tax benefits due to foreign currency translation
(3
)
Balance as of March 31, 2017
$
389