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Borrowings - Narrative (Detail) - USD ($) $ in Billions | Mar. 31, 2022 | Dec. 31, 2021
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Federal Funds Purchased |  |
Debt Instrument [Line Items] |  |
Aggregate availability under federal funds line | $ 0.7 | $ 1.3

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Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
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