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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-11-17</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001601712</issuerCik>
        <issuerName>Synchrony Financial</issuerName>
        <issuerTradingSymbol>SYF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001233154</rptOwnerCik>
            <rptOwnerName>CARY WILLIAM H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SYNCHRONY FINANCIAL</rptOwnerStreet1>
            <rptOwnerStreet2>777 LONG RIDGE ROAD</rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06902</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>On November 17, 2015, General Electric Company (&quot;GE&quot;) announced the completion of its offer to exchange shares of GE common stock for all of the common stock of Synchrony Financial (the &quot;Company&quot;) owned by GE (the &quot;Exchange Offer&quot;).  Effective November 17, 2015, Mr. Cary resigned from the Company's Board of Directors.</remarks>

    <ownerSignature>
        <signatureName>/s/  Danielle Do, as attorney in fact</signatureName>
        <signatureDate>2015-11-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
