Loans - By Portfolio Segment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loan balances by portfolio segment:
Retained loans	$ 1,299,590	$ 1,280,870	$ 1,089,598
Held-for-sale	7,048	3,985
At fair value	41,350	38,851
Total	1,347,988	1,323,706
Accrued interest receivables	6,600	6,800
Accrued interest receivables written off	84	49
Consumer, excluding credit card
Loan balances by portfolio segment:
Retained loans	376,334	397,275	300,753
Held-for-sale	945	487
At fair value	15,531	12,331
Total	392,810	410,093
Credit card
Loan balances by portfolio segment:
Retained loans	232,860	211,123
Held-for-sale	0	0
At fair value	0	0
Total	232,860	211,123
Wholesale
Loan balances by portfolio segment:
Retained loans	690,396	672,472	$ 603,670
Held-for-sale	6,103	3,498
At fair value	25,819	26,520
Total	$ 722,318	$ 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
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

+ References

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

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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

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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
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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
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