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Leases - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease liability | $ 2,200 | $ 1,663 | $ 2,257 |  |
Operating lease right-of-use assets | 2,100 | 1,548 | 2,100 |  |
Cumulative effect adjustment |  | (1,792) | 175 | $ 5,309 | $ 8,287
Future lease payments |  | 285 |  |  |
Total lease receivable |  | $ 298 | $ 298 |  |
Remaining lease term |  | 7 years | 7 years |  |
Opening retained earnings adjustments: adoption of new accounting standards |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  | (13) | 11
Impairment charges | 89 |  |  |  |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Noncancelable lease terms |  | 5 years |  |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Noncancelable lease terms |  | 15 years |  |  |
Retained Earnings |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment |  | $ 9,030 | $ 8,202 | 13,022 | 12,409
Retained Earnings | Opening retained earnings adjustments: adoption of new accounting standards |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Cumulative effect adjustment | $ 69 |  |  | $ (13) | $ 11

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Future Lease Payments + References No definition available. + Details
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- Definition Lessor, Sales-type and Direct Financing Leases, Weighted Average Remaining Lease Term + References No definition available. + Details
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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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