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Financing Arrangements (Tables)
 6 Months Ended
Sep. 30, 2025
Debt Disclosure [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, 2025
As of
March 31, 2025
Senior Notes:
4.80% Senior Notes due 2026
$400 $400 
1.85% Senior Notes due 2031
750 750 
2.95% Senior Notes due 2051
750 750 
Total principal amount$1,900 $1,900 
Unaccreted discount(4)(5)
Unamortized debt issuance costs(11)(11)
Net carrying value of Senior Notes$1,885 $1,884 
Fair value of Senior Notes (Level 2)$1,549 $1,511 
Interest and Other Income
The following table summarizes our interest expense recognized for the three and six months ended September 30, 2025 and 2024 that is included in interest and other income (expense), net on our Condensed Consolidated Statements of Operations (in millions):
Three Months Ended
September 30,		Six Months Ended
September 30,
2025202420252024
Amortization of debt issuance costs$(1)$— $(1)$(1)
Coupon interest expense(14)(14)(28)(28)
Total interest expense$(15)$(14)$(29)$(29)