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Leases - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease liability | $ 2,200 | $ 2,257 | $ 2,014 |  |
Operating lease right-of-use assets | 2,100 | 2,100 | 1,886 |  |
Cumulative effect adjustment |  | 175 | 5,309 | $ 8,287 | $ 10,057
Rent expense |  |  |  | 576 |
Minimum sublease income |  | 202 |  |  |
Future lease payments |  | 217 |  |  |
Total lease receivable |  | $ 298 | $ 272 |  |
Remaining lease term |  | 7 years | 7 years |  |
Real Property |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Renewal option increments for leases (in years) |  | 5 years |  |  |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Noncancelable lease terms |  | 5 years |  |  |
Minimum | Building |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  | 1 year |  |  |
Minimum | Equipment |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  | 1 year |  |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Noncancelable lease terms |  | 15 years |  |  |
Maximum | Building |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  | 15 years |  |  |
Maximum | Equipment |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Lease term |  | 5 years |  |  |
Opening retained earnings adjustments: adoption of new accounting standard |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  | $ (13) | 11 | 154
Impairment charges | 89 |  |  |  |
Retained Earnings |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment |  | $ 8,202 | 13,022 | 12,409 | 12,986
Retained Earnings | Opening retained earnings adjustments: adoption of new accounting standard |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment | $ 69 |  | $ (13) | $ 11 | $ 154

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