Non-consolidated variable interest entities - Additional Information (Details) $ in Billions	9 Months Ended
Sep. 30, 2020 USD ($) NumberOfVIE	Dec. 31, 2019 USD ($)
Variable Interest Entity
Number of VIEs \| NumberOfVIE	3
FNMA, GNMA, FHLMC VIE
Variable Interest Entity
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement \| $	$ 8.8	$ 9.9

This is the principal amount outstanding for securitized loans only (across all types of loans).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Number of Variable Interest Entities (VIE) or potential VIEs for which the necessary information is unable to be obtained to: (1) determine whether the legal entity is a VIE, (2) determine whether it (the reporting entity) is the VIE's primary beneficiary, or (3) perform the accounting required to consolidate the VIE for which it is determined that it (the reporting entity) is the primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5747-111685

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- Details

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