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Income Taxes (Tables)
 12 Months Ended
Mar. 31, 2018
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, 2018, 2017 and 2016 are as follows (in millions): 
 
Year Ended March 31,
 
2018
 
2017
 
2016
Domestic
$
440

 
$
382

 
$
133

Foreign
1,009

 
828

 
744

Income before provision for (benefit from) income taxes
$
1,449

 
$
1,210

 
$
877
Provision For (Benefit From) Income Taxes
Provision for (benefit from) income taxes for the fiscal years ended March 31, 2018, 2017 and 2016 consisted of (in millions):
 
Current
 
Deferred
 
Total
Year Ended March 31, 2018
 
 
 
 
 
Federal
$
138

 
$
197

 
$
335

State
4

 
9

 
13

Foreign
61

 
(3
)
 
58

 
$
203

 
$
203

 
$
406

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
)
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, 2018, 2017 and 2016 were as follows: 
 
Year Ended March 31,
 
2018
 
2017
 
2016
Statutory federal tax expense rate
31.5
 %
 
35.0
 %
 
35.0
 %
State taxes, net of federal benefit
0.8
 %
 
1.0
 %
 
0.5
 %
Differences between statutory rate and foreign effective tax rate
(19.1
)%
 
(19.3
)%
 
(22.1
)%
Valuation allowance
—
 %
 
—
 %
 
(51.7
)%
Tax reform
16.2
 %
 
—
 %
 
—
 %
Excess tax benefit
(3.0
)%
 
—
 %
 
—
 %
Research and development credits
(1.4
)%
 
(0.7
)%
 
(0.6
)%
Unremitted earnings of foreign subsidiaries
—
 %
 
2.2
 %
 
4.9
 %
Non-deductible stock-based compensation
2.7
 %
 
2.3
 %
 
3.1
 %
Other
0.3
 %
 
(0.4
)%
 
(0.9
)%
Effective tax expense (benefit) rate
28.0
 %
 
20.1
 %
 
(31.8
)%
Deferred Tax Assets And Liabilities
The components of net deferred tax assets, as of March 31, 2018 and 2017 consisted of (in millions): 
 
As of March 31,
 
2018
 
2017
Deferred tax assets:
 
 
 
Accruals, reserves and other expenses
$
81

 
$
151

Tax credit carryforwards
121

 
276

Stock-based compensation
24

 
37

Net operating loss & capital loss carryforwards
23

 
25

Total
249

 
489

Valuation allowance
(138
)
 
(114
)
Deferred tax assets, net of valuation allowance
111

 
375

Deferred tax liabilities:
 
 
 
Amortization and depreciation
(27
)
 
(19
)
Unremitted earnings of foreign subsidiaries
—

 
(70
)
Prepaids and other liabilities
(2
)
 
(1
)
Total
(29
)
 
(90
)
Deferred tax assets, net of valuation allowance and deferred tax liabilities
$
82

 
$
285
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, 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

Increases in unrecognized tax benefits related to prior year tax positions
10

Decreases in unrecognized tax benefits related to prior year tax positions
(12
)
Increases in unrecognized tax benefits related to current year tax positions
75

Decreases in unrecognized tax benefits related to settlements with taxing authorities
(7
)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations
(2
)
Changes in unrecognized tax benefits due to foreign currency translation
4

Balance as of March 31, 2018
$
457