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Income Taxes (Tables)
 12 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Components Of Income Before Provision For (Benefit From) Income Taxes
The components of our income before provision for income taxes for the fiscal years ended March 31, 2019, 2018 and 2017 are as follows (in millions): 
 
Year Ended March 31,
 
2019
 
2018
 
2017
Domestic
$
170

 
$
440

 
$
382

Foreign
909

 
1,009

 
828

Income before provision for income taxes
$
1,079

 
$
1,449

 
$
1,210
Provision For (Benefit From) Income Taxes
Provision for income taxes for the fiscal years ended March 31, 2019, 2018 and 2017 consisted of (in millions):
 
Current
 
Deferred
 
Total
Year Ended March 31, 2019
 
 
 
 
 
Federal
$
29

 
$
(18
)
 
$
11

State
5

 
—

 
5

Foreign
42

 
2

 
44

 
$
76

 
$
(16
)
 
$
60

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
Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate
The differences between the statutory tax expense rate and our effective tax expense rate, expressed as a percentage of income before provision for income taxes, for the fiscal years ended March 31, 2019, 2018 and 2017 were as follows: 
 
Year Ended March 31,
 
2019
 
2018
 
2017
Statutory federal tax expense rate
21.0
 %
 
31.5
 %
 
35.0
 %
State taxes, net of federal benefit
0.7
 %
 
0.8
 %
 
1.0
 %
Differences between statutory rate and foreign effective tax rate
(14.4
)%
 
(19.1
)%
 
(19.3
)%
Tax reform
(0.4
)%
 
16.2
 %
 
—
 %
Excess tax benefit
(1.9
)%
 
(3.0
)%
 
—
 %
Research and development credits
(2.4
)%
 
(1.4
)%
 
(0.7
)%
Unremitted earnings of foreign subsidiaries
—
 %
 
—
 %
 
2.2
 %
Non-deductible stock-based compensation
2.3
 %
 
2.7
 %
 
2.3
 %
Other
0.7
 %
 
0.3
 %
 
(0.4
)%
Effective tax expense rate
5.6
 %
 
28.0
 %
 
20.1
 %
Deferred Tax Assets And Liabilities
The components of net deferred tax assets, as of March 31, 2019 and 2018 consisted of (in millions): 
 
As of March 31,
 
2019
 
2018
Deferred tax assets:
 
 
 
Accruals, reserves and other expenses
$
101

 
$
81

Tax credit carryforwards
140

 
121

Stock-based compensation
33

 
24

Net operating loss & capital loss carryforwards
22

 
23

Total
296

 
249

Valuation allowance
(162
)
 
(138
)
Deferred tax assets, net of valuation allowance
134

 
111

Deferred tax liabilities:
 
 
 
Amortization and depreciation
(28
)
 
(27
)
Change in tax accounting method
(66
)
 
—

Other
(7
)
 
(2
)
Total
(101
)
 
(29
)
Deferred tax assets, net of valuation allowance and deferred tax liabilities
$
33

 
$
82
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, 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

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

Decreases in unrecognized tax benefits related to prior year tax positions
(41
)
Increases in unrecognized tax benefits related to current year tax positions
43

Decreases in unrecognized tax benefits related to settlements with taxing authorities
(16
)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations
(21
)
Changes in unrecognized tax benefits due to foreign currency translation
(5
)
Balance as of March 31, 2019
$
417