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Restructuring Costs - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 104 | $ 74 | $ 441 | $ 248
Fiscal 2020 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  | 3 |
Cost incurred to date | 295 |  | 295 |
Fiscal 2020 Plan | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  | 7 |
Cost incurred to date | 278 |  | 278 |
Fiscal 2020 Plan | Facilities Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  | (4) |
Cost incurred to date | 17 |  | 17 |
Fiscal 2019 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  | (5) |
Cost incurred to date | 477 |  | 477 |
Fiscal 2019 Plan | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  | (2) |
Cost incurred to date | 336 |  | 336 |
Fiscal 2019 Plan | Facilities Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  | (3) |
Cost incurred to date | 141 |  | 141 |
Fiscal 2018 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cost incurred to date | 987 |  | 987 |
Fiscal 2018 Plan | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cost incurred to date | 791 |  | 791 |
Fiscal 2018 Plan | Facilities Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cost incurred to date | $ 196 |  | $ 196 |

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