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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-10-03</periodOfReport>

    <issuer>
        <issuerCik>0001398987</issuerCik>
        <issuerName>REALOGY HOLDINGS CORP.</issuerName>
        <issuerTradingSymbol>RLGY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001310215</rptOwnerCik>
            <rptOwnerName>Alvarez Ralph</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O REALOGY HOLDINGS CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>175 PARK AVENUE</rptOwnerStreet2>
            <rptOwnerCity>MADISON</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07940</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $0.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2016-10-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>882</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>26.22</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19684</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Deferred stock units issued for quarterly director cash fees of $23,125 pursuant to an election previously made under the Realogy Holdings Corp. Director Deferred Compensation Plan. Each deferred stock unit entitles the reporting person to receive one share of common stock at the earlier of a date determined by the reporting person or upon the reporting person's retirement or termination of service from the Board of Directors.</footnote>
    </footnotes>

    <remarks>Exhibit 24.1 - Power of Attorney of Ralph Alvarez.* *Previously filed.</remarks>

    <ownerSignature>
        <signatureName>/s/ Seth I. Truwit, as attorney-in-fact for Ralph Alvarez</signatureName>
        <signatureDate>2016-10-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
