Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Loan balances by portfolio segment:
Retained	$ 1,285,370	$ 1,280,870	$ 1,265,941
Held-for-sale	12,504	3,985
Loans at fair value	42,137	38,851
Total	1,340,011	1,323,706
Accrued interest receivables	6,700	6,800
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained	377,938	397,275	397,054
Held-for-sale	1,101	487
Loans at fair value	15,906	12,331
Total	394,945	410,093
Credit card
Loan balances by portfolio segment:
Retained	219,542	211,123
Held-for-sale	0	0
Loans at fair value	0	0
Total	219,542	211,123
Wholesale
Loan balances by portfolio segment:
Retained	687,890	672,472	$ 671,952
Held-for-sale	11,403	3,498
Loans at fair value	26,231	26,520
Total	$ 725,524	$ 702,490

Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Losses, Net of Deferred Income

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- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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- Definition

Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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-Topic 948
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477011/948-310-45-1

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- References

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