Regulatory Requirements - Schedule of Building Block Approach (Details) - Banking Regulation, Building Block Approach $ in Millions	Dec. 31, 2025 USD ($) Rate
Regulatory capital
BBA available capital	$ 4,144
BBA capital requirement	$ 419
BBA ratio \| Rate	989.00%

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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Amount of tangible capital as defined by regulatory framework.

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Amount of minimum tangible capital 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
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-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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Ratio of tangible capital to tangible assets as defined by regulatory framework.

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