<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-01-02</periodOfReport>

    <issuer>
        <issuerCik>0001331875</issuerCik>
        <issuerName>Fidelity National Financial, Inc.</issuerName>
        <issuerTradingSymbol>FNF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001053288</rptOwnerCik>
            <rptOwnerName>WILLIE DAVIS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>601 RIVERSIDE AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>JACKSONVILLE</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>32204</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-01-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>452</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>66665</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of Fidelity National Financial, Inc. (&quot;FNF&quot;) acquired as a result of the conversion of shares of common stock of Lender Processing Services, Inc. (&quot;LPS&quot;) into the right to receive $28.102 in cash and 0.28742 shares of FNF Class A Common Stock (which had a closing price of $32.25 on January 2, 2014) pursuant to the Agreement and Plan of Merger, dated as of May 28, 2013, by and among FNF, Lion Merger Sub, Inc. and LPS.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Michael L. Gravelle, as attorney-in-fact</signatureName>
        <signatureDate>2014-01-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
