Regulation and Capital Adequacy - Risk Based Capital Requirements (Detail) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Standardized
Risk Based Capital Requirements [Abstract]
CET1 capital ratio	0.045	0.045
Tier 1 capital ratio	0.060	0.060
Total capital ratio	0.080	0.080
Advanced
Risk Based Capital Requirements [Abstract]
CET1 capital ratio	0.045	0.045
Tier 1 capital ratio	0.060	0.060
Total capital ratio	0.080	0.080
Reportable Legal Entities
Risk Based Capital Requirements [Abstract]
CET1 capital ratio	0.045	0.045
Tier 1 capital ratio	0.060	0.060
Total capital ratio	0.105	0.105
Reportable Legal Entities \| Standardized
Risk-Based Capital and Risk-Weighted Assets [Abstract]
CET1 capital	$ 64,251	$ 62,022
Tier 1 capital	64,251	62,022
Tier 2 capital	4,454	4,209
Total capital	68,705	66,231
RWAs	$ 404,962	$ 386,922
Risk-Based Capital Ratios [Abstract]
CET1 capital ratio	0.159	0.160
Tier 1 capital ratio	0.159	0.160
Total capital ratio	0.170	0.171
Reportable Legal Entities \| Advanced
Risk-Based Capital and Risk-Weighted Assets [Abstract]
CET1 capital	$ 64,251	$ 62,022
Tier 1 capital	64,251	62,022
Tier 2 capital	1,124	955
Total capital	65,375	62,977
RWAs	$ 308,247	$ 284,624
Risk-Based Capital Ratios [Abstract]
CET1 capital ratio	0.208	0.218
Tier 1 capital ratio	0.208	0.218
Total capital ratio	0.212	0.221

Risk-Based Capital and Risk-Weighted Assets

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Risk-Based Capital Ratios

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Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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Amount of total capital as defined by regulatory framework.

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Amount of Tier 2 risk-based capital as defined by regulatory framework.

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