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Stock-Based Compensation (Tables)
 3 Months Ended
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Assumptions Used In Monte Carlo Simulation Model
 
 
Three months ended
June 30,
 
 
2017
 
2016
Risk-free interest rate
 
1.5% - 1.6%

 
0.8
%
Expected volatility
 
17 - 46%

 
16 - 57%

Weighted-average volatility
 
28
%
 
29
%
Expected dividends
 
None

 
None
Schedule Of Stock-Based Compensation Expense By Statement Of Operations
 
Three months ended
June 30,
 
2017
 
2016
Cost of revenue
$
1

 
$
1

Research and development
28

 
27

Marketing and sales
7

 
7

General and administrative
12

 
13

Stock-based compensation expense
$
48

 
$
48
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award
 
 
Options
(in thousands)
 
Weighted-
Average
Exercise Prices
 
Weighted-
Average
Remaining
Contractual
Term  (in years)
 
Aggregate
Intrinsic Value
(in millions)
Outstanding as of March 31, 2017
 
2,377

 
$
33.35

 
 
 
 
Granted
 
1

 
94.79

 
 
 
 
Exercised
 
(736
)
 
40.56

 
 
 
 
Forfeited, cancelled or expired
 
(2
)
 
47.06

 
 
 
 
Outstanding as of June 30, 2017
 
1,640

 
$
30.15

 
6.14
 
$
124

Vested and expected to vest
 
1,640

 
$
30.15

 
6.14
 
$
124

Exercisable as of June 30, 2017
 
1,452

 
$
30.14

 
6.08
 
$
110
Restricted Stock Rights [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award
 
 
Restricted
Stock Rights
(in thousands)
 
Weighted-
Average Grant
Date Fair Values
Outstanding as of March 31, 2017
 
5,153

 
$
65.03

Granted
 
1,691

 
110.06

Vested
 
(1,909
)
 
110.43

Forfeited or cancelled
 
(126
)
 
71.07

Outstanding as of June 30, 2017
 
4,809

 
$
62.68
Performance Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award
 
Performance-
Based Restricted
Stock Units
(in thousands)
 
Weighted-
Average Grant
Date Fair Value
Outstanding as of March 31, 2017
—

 
$
—

Granted
796

 
110.51

Forfeited or cancelled
—

 
—

Outstanding as of June 30, 2017
796

 
$
110.51
Market-Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award
 
 
Market-Based
Restricted  Stock
Units
(in thousands)
 
Weighted-
Average  Grant
Date Fair Value
Outstanding as of March 31, 2017
 
1,282

 
$
87.37

Granted
 
706

 
140.93

Vested
 
(430
)
 
76.27

Forfeited or cancelled
 
(216
)
 
91.88

Outstanding as of June 30, 2017
 
1,342

 
$
118.35
Repurchase Program, Total [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure Of Stock-Based Compensation Arrangements By Stock-Based Payment Award
 
May 2015 Program
 
May 2017 Program
Total
(in millions)
Shares
 
Amount
 
Shares
 
Amount
Shares
 
Amount
Three months ended June 30, 2016
1.9
 
$
129

 
—

 
$
—

1.9
 
$
129

Three months ended June 30, 2017
0.3

 
$
31

 
1.1

 
$
119

1.4
 
$
150