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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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- 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 + Details
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