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Variable Interest Entities and Securitizations - External Debt and Receivable Balances of Securitization Programs (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Credit Card |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Securities held by third-party investors, non-mortgage | $ 14,175 | $ 15,798
Receivables in the trust, non-mortgage | 28,451 | 31,625
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 | 2,966 | 2,010
Receivables in the trust, non-mortgage | 3,221 | 2,192
Cash balance of spread or reserve accounts, non-mortgage | 10 | 7
Home Loan |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Securities held by third-party investors, mortgage | 913 | 962
Receivables in the trust, mortgage | 927 | 978
Cash balance of spread or reserve accounts, mortgage | $ 15 | $ 17

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