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Regulation and Capital Adequacy - Risk-Based Capital Ratios (Detail) - Group Inc. $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Standardized |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
CET1 capital | $ 103,769 | $ 103,065
Tier 1 capital | 118,515 | 115,647
Tier 2 capital | 14,209 | 14,125
Total capital | 132,724 | 129,772
RWAs | $ 723,406 | $ 688,541
CET1 capital ratio | 0.143 | 0.150
Tier 1 capital ratio | 0.164 | 0.168
Total capital ratio | 0.183 | 0.188
Advanced |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
CET1 capital | $ 103,769 | $ 103,065
Tier 1 capital | 118,515 | 115,647
Tier 2 capital | 10,164 | 10,164
Total capital | 128,679 | 125,811
RWAs | $ 687,426 | $ 674,812
CET1 capital ratio | 0.151 | 0.153
Tier 1 capital ratio | 0.172 | 0.171
Total capital ratio | 0.187 | 0.186

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