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Net Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2025
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Summary of Capital Adequacy Requirements |
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | To Be Well Capitalized Under Prompt Corrective Action Provisions |
(in millions) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk weighted assets) |  | $ | 851 |  |  |  | 114.6 | % |  | $ | 59 |  |  |  | 8.0 | % |  | $ | 74 |  |  |  | 10.0 | %
Common Equity Tier 1 capital (to risk weighted assets) |  | $ | 846 |  |  |  | 114.0 | % |  | $ | 33 |  |  |  | 4.5 | % |  | $ | 48 |  |  |  | 6.5 | %
Tier 1 capital (to risk weighted assets) |  | $ | 846 |  |  |  | 114.0 | % |  | $ | 45 |  |  |  | 6.0 | % |  | $ | 59 |  |  |  | 8.0 | %
Tier 1 capital (to average assets) |  | $ | 846 |  |  |  | 67.6 | % |  | $ | 50 |  |  |  | 4.0 | % |  | $ | 63 |  |  |  | 5.0 | %
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk weighted assets) |  | $ | 961 |  |  |  | 153.2 | % |  | $ | 50 |  |  |  | 8.0 | % |  | $ | 63 |  |  |  | 10.0 | %
Common Equity Tier 1 capital (to risk weighted assets) |  | $ | 953 |  |  |  | 151.9 | % |  | $ | 28 |  |  |  | 4.5 | % |  | $ | 41 |  |  |  | 6.5 | %
Tier 1 capital (to risk weighted assets) |  | $ | 953 |  |  |  | 151.9 | % |  | $ | 38 |  |  |  | 6.0 | % |  | $ | 50 |  |  |  | 8.0 | %
Tier 1 capital (to average assets) |  | $ | 953 |  |  |  | 71.3 | % |  | $ | 53 |  |  |  | 4.0 | % |  | $ | 67 |  |  |  | 5.0 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + 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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