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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-10-07</periodOfReport>

    <issuer>
        <issuerCik>0001288776</issuerCik>
        <issuerName>Google Inc.</issuerName>
        <issuerTradingSymbol>GOOG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001295032</rptOwnerCik>
            <rptOwnerName>Brin Sergey</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GOOGLE INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1600 AMPHITHEATRE PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>MOUNTAIN VIEW</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94043</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <officerTitle>Co-Founder</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Class A Common Stock</value>
                <footnoteId id="F1"/>
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            <transactionTimeliness></transactionTimeliness>
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                <transactionPricePerShare>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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                </directOrIndirectOwnership>
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        <nonDerivativeTransaction>
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                </sharesOwnedFollowingTransaction>
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        <nonDerivativeTransaction>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class C Capital Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-10-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3430</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>571.4377</value>
                    <footnoteId id="F23"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22660824</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class C Capital Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-10-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5480</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>572.4305</value>
                    <footnoteId id="F24"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22655344</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class C Capital Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-10-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1800</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>573.21</value>
                    <footnoteId id="F25"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22653544</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class C Capital Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-10-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>574.75</value>
                    <footnoteId id="F26"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22653244</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class C Capital Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-10-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>575.00</value>
                    <footnoteId id="F27"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22651944</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-10-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>83334</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F28"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F29"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>83334</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22576944</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each share of Class A Common Stock issued upon conversion of one share of Class B Common Stock at election of reporting person.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $574.32 to $574.99, inclusive. The reporting person undertakes to provide to any security holder of Google Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) through (13) and (15) through (27) to this Form 4.</footnote>
        <footnote id="F3">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $575.00 to $575.99, inclusive.</footnote>
        <footnote id="F4">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $576.00 to $576.99, inclusive.</footnote>
        <footnote id="F5">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $577.00 to $577.99, inclusive.</footnote>
        <footnote id="F6">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $578.00 to $579.99, inclusive.</footnote>
        <footnote id="F7">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $579.00 to $579.99, inclusive.</footnote>
        <footnote id="F8">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $580.00 to $580.99, inclusive.</footnote>
        <footnote id="F9">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $581.00 to $581.99, inclusive.</footnote>
        <footnote id="F10">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $582.00 to $582.99, inclusive.</footnote>
        <footnote id="F11">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $583.00 to $583.99, inclusive.</footnote>
        <footnote id="F12">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $584.00 to $584.99, inclusive.</footnote>
        <footnote id="F13">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $585.00 to $585.99, inclusive.</footnote>
        <footnote id="F14">On January 29, 2014, Google Inc. declared a stock dividend, as a result of which all holders of record of Class A Common Stock on March 27, 2014 received on April 2, 2014 one share of Class C Capital Stock for each share of Class A Common Stock outstanding (the &quot;Stock Dividend&quot;). These GSUs were previously reported as GSUs entitling the Reporting Person to receive one share of Google Inc.'s Class A Common Stock for each share underlying the GSU as the GSU vests.  As a result of the Stock Dividend, these GSUs were adjusted and each share underlying the GSU now corresponds to one share of Class A Common Stock and one share of Class C Capital Stock.</footnote>
        <footnote id="F15">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $563.88 to $563.99, inclusive.</footnote>
        <footnote id="F16">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $564.00 to $564.99, inclusive.</footnote>
        <footnote id="F17">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $565.00 to $565.99, inclusive.</footnote>
        <footnote id="F18">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $566.00 to $566.99, inclusive.</footnote>
        <footnote id="F19">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $567.00 to $567.99, inclusive.</footnote>
        <footnote id="F20">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $568.00 to $568.99, inclusive.</footnote>
        <footnote id="F21">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $569.00 to $569.99, inclusive.</footnote>
        <footnote id="F22">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $570.00 to $570.99, inclusive.</footnote>
        <footnote id="F23">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $571.00 to $571.99, inclusive.</footnote>
        <footnote id="F24">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $572.00 to $572.99, inclusive.</footnote>
        <footnote id="F25">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $573.00 to $573.99, inclusive.</footnote>
        <footnote id="F26">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $574.00 to $574.99, inclusive.</footnote>
        <footnote id="F27">The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $575.00 to $575.99, inclusive.</footnote>
        <footnote id="F28">All shares are exercisable as of the transaction date.</footnote>
        <footnote id="F29">There is no expiration date for the Issuer's Class B Common Stock.</footnote>
    </footnotes>

    <remarks>All transactions reported in this Form 4 were effected pursuant to a 10b5-1 Trading Plan adopted by the Reporting Person.</remarks>

    <ownerSignature>
        <signatureName>/s/ Valentina Margulis, as attorney-in-fact for Sergey Brin</signatureName>
        <signatureDate>2014-10-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
