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Variable Interest Entities and Securitizations - External Debt and Receivable Balances of Securitization Programs (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Credit Card |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Securities held by third-party investors, non-mortgage | $ 15,798 | $ 18,307
Receivables in the trust, non-mortgage | 31,625 | 34,197
Cash balance of spread or reserve accounts, non-mortgage | 0 | 0
Auto |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Securities held by third-party investors, non-mortgage | 2,010 |
Receivables in the trust, non-mortgage | 2,192 |
Cash balance of spread or reserve accounts, non-mortgage | 7 |
Home Loan |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Securities held by third-party investors, mortgage | 962 | 1,276
Receivables in the trust, mortgage | 978 | 1,305
Cash balance of spread or reserve accounts, mortgage | $ 17 | $ 116

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