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Financing Arrangement (Tables)
 3 Months Ended
Jun. 30, 2020
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, 2020
As of
March 31, 2020
Senior Notes:
3.70% Senior Notes due 2021$600  $600  
4.80% Senior Notes due 2026400  400  
Total principal amount$1,000  $1,000  
Unaccreted discount(1) (1) 
Unamortized debt issuance costs(3) (3) 
Net carrying value of Senior Notes$996  $996  
Fair value of Senior Notes (Level 2)$1,091  $1,030  
Schedule Of Interest Expense
The following table summarizes our interest expense recognized for the three months ended June 30, 2020 and 2019 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):
Three Months Ended
June 30,
20202019
Amortization of debt issuance costs$(1) $(1) 
Coupon interest expense(10) (10) 
Total interest expense$(11) $(11)