Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Name:	us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Loans and ACL - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Loans and ACL - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Modifications that defaulted during the period that had been classified as a TDR during the previous 12 months	$ 78	$ 76	$ 104
Residential mortgage loan sale	4,300
Financing Receivable
Transfer of loans HFI to LHFS	7,434	$ 77	$ 1,050
Divestiture [Member]
Financing Receivable
Transfer of loans HFI to LHFS	381
Residential Mortgage
Financing Receivable
Transfer of loans HFI to LHFS	2,500
Commercial:
Financing Receivable
Transfer of loans HFI to LHFS	$ 356