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Financing Arrangement (Tables)
 12 Months Ended
Mar. 31, 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
March 31, 2020		As of
March 31, 2019
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) (5) 
Net carrying value of Senior Notes$996  $994  
Fair value of Senior Notes (Level 2)$1,030  $1,039  
Schedule Of Interest Expense Related To Notes
The following table summarizes our interest expense recognized for fiscal years 2020, 2019, and 2018 that is included in interest and other income (expense), net on our Consolidated Statements of Operations (in millions): 
Year Ended March 31,
202020192018
Amortization of debt discount$—  $(1) $—  
Amortization of debt issuance costs(2) (2) (2) 
Coupon interest expense(42) (41) (42) 
Other interest expense—  (1) —  
Total interest expense$(44) $(45) $(44)