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Intangible Assets
 6 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets 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 

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 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