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Financing Arrangement (Tables)
 12 Months Ended
Mar. 31, 2021
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, 2021
As of
March 31, 2020
Senior Notes:
4.80% Senior Notes due 2026$400 $400 
1.85% Senior Notes due 2031750 — 
2.95% Senior Notes due 2051750 — 
3.70% Senior Notes due 2021— 600 
Total principal amount$1,900 $1,000 
Unaccreted discount(7)(1)
Unamortized debt issuance costs(17)(3)
Net carrying value of Senior Notes$1,876 $996 
Fair value of Senior Notes (Level 2)$1,873 $1,030 
Schedule Of Interest Expense Related To Notes
The following table summarizes our interest expense recognized for fiscal years 2021, 2020, and 2019 that is included in interest and other income (expense), net on our Consolidated Statements of Operations (in millions):
Year Ended March 31,
202120202019
Amortization of debt discount$— $— $(1)
Amortization of debt issuance costs(2)(2)(2)
Coupon interest expense(43)(42)(41)
Other interest expense— — (1)
Total interest expense$(45)$(44)$(45)