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Variable Interest Entities and Securitizations - Continuing Involvement in Securitization Related VIEs (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Credit Card
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Securities held by third-party investors, non-mortgage	$ 11,224	$ 15,798
Receivables in the trust, non-mortgage	27,797	31,625
Cash balance of spread or reserve accounts, non-mortgage	0	0
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Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Securities held by third-party investors, non-mortgage	2,342	2,010
Receivables in the trust, non-mortgage	2,548	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	832	962
Receivables in the trust, mortgage	838	978
Cash balance of spread or reserve accounts, mortgage	$ 15	$ 17

X

- Definition

Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Cash Balance in Spread and Reserve Accounts

+ References

No definition available.

+ Details

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X

- Definition

Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Liabilities Incurred

+ References

No definition available.

+ Details

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X

- Definition

Continuing Involvement with Derecognized Transferred Financial Assets, Cash Balance of Reserve or Spread Accounts

+ References

No definition available.

+ Details

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X

- Definition

Continuing Involvement with Derecognized Transferred Financial Assets, Liabilities Incurred

+ References

No definition available.

+ Details

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X

- Definition

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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- Definition

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 of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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