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Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Amount available for dividend payments to parent company without prior regulatory approval | $ 7,400 |  |
Outstanding cash reserves at the Federal Reserve Bank | 39,000 |  |
FDIC-Related Assessments |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Loss contingency | $ (18) | $ 130 | $ 515

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- Definition Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock. + References No definition available. + Details
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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
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