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Loans, Lending Commitments and Related Allowance for Credit Losses - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($) loan	Dec. 31, 2024 USD ($)
Financing Receivable, Modified [Line Items]
Past due loans	$ 257,080		$ 226,900
90+ days Past Due
Financing Receivable, Modified [Line Items]
Past due loans		$ 67
Commercial real estate
Financing Receivable, Modified [Line Items]
Past due loans	$ 7,853		$ 8,412
Commercial real estate | 90+ days Past Due
Financing Receivable, Modified [Line Items]
Number of investments | loan	0	1
Past due loans		$ 67

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- Definition

Financing Receivable, Excluding Accrued Interest, Number of Defaulted and Modified Investments

+ References

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- Definition

Financing Receivable, Modified [Line Items]

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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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