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Note Fair Value of financial instruments- Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Letter Of Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure Off balance Sheet Risks Face Amount Asset | $ 33 | $ 36
Commitments To Extend Credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure Off balance Sheet Risks Face Amount Asset | $ 7,500 | $ 7,600

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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 No definition available. + Details
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- Details
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