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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Mar. 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 8,507 | $ 8,465
Accumulated Amortization | 4,816 | 4,422
Net Carrying Value | 3,691 | 4,043
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,096 | 4,014
Accumulated Amortization | 2,944 | 2,733
Net Carrying Value | 1,152 | 1,281
Customer related intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,176 | 4,212
Accumulated Amortization | 1,817 | 1,641
Net Carrying Value | 2,359 | 2,571
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 235 | 239
Accumulated Amortization | 55 | 48
Net Carrying Value | $ 180 | $ 191

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