Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Subsequent Events (Details) - Securitized debt - Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure - Securitized Loans - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2019	Sep. 30, 2018	Sep. 30, 2018
Subsequent Event [Line Items]
Acquired securitized debt collateral outstanding principal balance		$ 277	$ 580
Subsequent Event
Subsequent Event [Line Items]
Acquired securitized debt collateral outstanding principal balance	$ 276