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Financing Arrangement (Tables)
 6 Months Ended
Sep. 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
September 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)$1,082 $1,030 
Schedule Of Interest Expense
The following table summarizes our interest expense recognized for the three and six months ended September 30, 2020 and 2019 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):
Three Months Ended
September 30,		Six Months Ended
September 30,
2020201920202019
Amortization of debt issuance costs$— $— $(1)$(1)
Coupon interest expense(11)(11)(21)(21)
Total interest expense$(11)$(11)$(22)$(22)