Leases - Rent Deferrals (Details) $ in Millions	3 Months Ended
Jun. 30, 2020 USD ($)
Medical office
Lessor, Lease, Description [Line Items]
Rent deferred during the period	$ 6
Life science
Lessor, Lease, Description [Line Items]
Rent deferred during the period	$ 1

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.

No definition available.

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