Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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

Goodwill Goodwill - Goodwill Accumulated Impairment Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,328,296	$ 4,513,296	$ 4,983,296
Commercial Banking and Wealth
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	1,930,830	2,659,830
Retail Banking
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	135,660	1,427,660
Corporate and Investment Banking
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 261,806	$ 425,806