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Financing Arrangement (Tables)
 3 Months Ended
Jun. 30, 2017
Debt Instruments [Abstract]  
Schedule of Carrying Values Of Liability and Equity Components of Senior Notes [Table Text Block]
The carrying and fair values of the Senior Notes are as follows (in millions): 
  
As of
June 30, 2017
 
As of
March 31, 2017
Senior Notes:
 
 
 
3.70% Senior Notes due 2021
$
600

 
$
600

4.80% Senior Notes due 2026
400

 
400

Total principal amount
$
1,000

 
$
1,000

Unaccreted discount
(2
)
 
(2
)
Unamortized debt issuance costs
(7
)
 
(8
)
Net carrying value of Senior Notes
$
991

 
$
990

 
 
 
 
Fair value of Senior Notes (Level 2)
$
1,063

 
$
1,054
Schedule Of Interest Expense
The following table summarizes our interest expense recognized for the three months ended June 30, 2017 and 2016 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions): 
 
Three months ended
June 30,
 
2017
 
2016
Amortization of debt discount
$
—

 
$
(1
)
Amortization of debt issuance costs
(1
)
 
(1
)
Coupon interest expense
(10
)
 
(11
)
Total interest expense
$
(11
)
 
$
(13
)