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Cash and Due from Banks (Details) - USD ($) $ in Billions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Cash and Cash Equivalents [Abstract] |  |
Average balance maintained | $ 1.8 | $ 1.1

X
- Definition Average amount of collected cash balances with commercial banks the Federal Home Loan Banks (FHLBanks) maintain in return for certain services. + References No definition available. + Details
Name: | us-gaap_AverageCollectedCashBalancesWithCommercialBanksFederalHomeLoanBank
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration