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Regulation and Capital Adequacy - Risk Based Capital Requirements (Detail) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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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

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