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Loans Loans - Auto Loan Credit Score Distribution - At Origination FICO Scores (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment	$ 265,809	$ 245,899	$ 254,473
Consumer Banking
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment	63,065	59,205
Auto | Consumer Banking
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment	60,362	56,341
Auto | Consumer Banking | FICO Score, Greater than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment	28,773	27,913
Auto | Consumer Banking | FICO Score, 621-660
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment	11,924	10,729
Auto | Consumer Banking | FICO Score, 620 or below
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment	$ 19,665	$ 17,699

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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.

+ References

No definition available.

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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