OTHER CONTINGENCIES AND COMMITMENTS (Oakland Headquarters Lease) (Details) ft² in Thousands, $ in Millions	Oct. 21, 2020 USD ($)	Jun. 05, 2020 USD ($) ft²
Commitments and Contingencies Disclosure [Abstract]
Rentable square feet \| ft²		910
Term of contract		34 years 11 months
Purchase options, land, value		$ 892
Subsequent event
Subsequent Event [Line Items]
Lease, option payment letter of credit	$ 75
Lease, security letter of credit	$ 75

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant