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Intangible Assets (Tables)
6 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Amortizable Intangible Assets
Intangible assets consisted of the following:

As of September 30, 2021
(in millions)Gross Carrying ValueAccumulated AmortizationNet Carrying Value
Software$4,096 $2,944 $1,152 
Customer related intangible assets4,176 1,817 2,359 
Other intangible assets235 55 180 
Total intangible assets$8,507 $4,816 $3,691 

As of March 31, 2021
(in millions)Gross Carrying ValueAccumulated AmortizationNet Carrying Value
Software$4,014 $2,733 $1,281 
Customer related intangible assets4,212 1,641 2,571 
Other intangible assets239 48 191 
Total intangible assets$8,465 $4,422 $4,043 
Schedule of Components of Amortization Expense
The components of amortization expense were as follows:

Three Months EndedSix Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Intangible asset amortization$223 $258 $437 $511 
Transition and transformation contract cost amortization(1)
60 67 110 128 
Total amortization expense$283 $325 $547 $639 
        

(1)Transition and transformation contract costs are included within other assets on the balance sheet.
Estimated Future Amortization of Intangible Assets
Estimated future amortization related to intangible assets as of September 30, 2021 is as follows:

Fiscal Year (in millions)
Remainder of 2022$435 
2023$749 
2024$649 
2025$547 
2026$507