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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Mar. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 8,564 | $ 10,078
Accumulated Amortization | 4,545 | 4,347
Net Carrying Value | 4,019 | 5,731
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,001 | 4,048
Accumulated Amortization | 2,891 | 2,614
Net Carrying Value | 1,110 | 1,434
Customer related intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,296 | 5,795
Accumulated Amortization | 1,606 | 1,697
Net Carrying Value | 2,690 | 4,098
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 267 | 235
Accumulated Amortization | 48 | 36
Net Carrying Value | $ 219 | $ 199

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