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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) $ in Millions | Dec. 31, 2024 USD ($) quarter | Dec. 31, 2023 USD ($) | Sep. 30, 2023 qtr | Jun. 30, 2023 qtr
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Financing Receivable, Allowance for Credit Losses |  |  |  |
Life time loss rate, period span | quarter | 8 |  |  |
Financing receivable and off balance sheet credit loss allowance | $ 742 | $ 706 |  |
Commercial lending |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Collateral dependent loans | 45 | 30 |  |
Consumer Lending |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Collateral dependent loans | $ 23 | $ 12 |  |
C&I |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Life time loss rate, period span | qtr |  |  | 8 | 11

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- Definition Reasonable and Supportable Forecast Period, Life Time Loss Rate, Number of Quarter + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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