Investments in Operating Leases, Net - Investments in Operating Leases, Net (Parenthetical) (Details) - USD ($) $ in Billions	Sep. 30, 2022	Mar. 31, 2022
Securitized investments in operating leases [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Investments in operating leases	$ 16.7	$ 16.2

Amount, before accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919398-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-Name Accounting Standards Codification
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-Section 45
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-URI https://asc.fasb.org/extlink&oid=123422147&loc=d3e41457-112716

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant