Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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

Loans - Consumer, Excluding Credit Card Loan Portfolio (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,089,598	$ 1,010,206	$ 960,506
Consumer, excluding credit card
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	300,753	295,556	$ 302,127
Consumer, excluding credit card \| Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	237,561	224,795
Consumer, excluding credit card \| Auto and other
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	63,192	70,761
Consumer, excluding credit card \| Auto and other \| Paycheck Protection Program (PPP)
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 350	$ 5,400