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IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Wellington Management Company, LLP 04-2683227ECHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [ ] SEC USE ONLY4CITIZENSHIP OR PLACE OF ORGANIZATION MassachusettsANUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH5. SOLE VOTING POWER6. SHARED VOTING POWER7. SOLE DISPOSITIVE POWER8. SHARED DISPOSITIVE POWERHAGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,213,969FCHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ]9PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 7.56%TYPE OF REPORTING PERSON IAItem 1.(a)1Name of Issuer Pioneer Natural Resources Company(b)mAddress of Issuer's Principal Executive Offices 5205 North O'Connor Boulevard Suite 200 Irving, TX 75039Item 2.UName of Person Filing Wellington Management Company, LLP (''Wellington Management'')eAddress of Principal Business Office or, if None, Residence 280 Congress Street Boston, MA 02210(c)Citizenship Massachusetts(d)*Title of Class of Securities Common Stock(e)CUSIP Number 723787107Item 3.oIf This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:HBroker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).>Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).LInsurance Company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).fInvestment Company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).EAn investment adviser in accordance with Rule 240.13d-1(b)(1)(ii)(E);(f)ZAn employee benefit plan or endowment fund in accordance with Rule 240.13d-1(b)(1)(ii)(F);(g)ZA parent holding company or control person in accordance with Rule 240.13d-1(b)(1)(ii)(G);(h)gA savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);(i)›A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);(j)6Group, in accordance with Rule 240.13d-1(b)(1)(ii)(J).HIf this statement is filed pursuant to Rule 13d-1(c), check this box [ ]Item 4. Ownership.ŽProvide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.Amount Beneficially Owned:МWellington Management, in its capacity as investment adviser, may be deemed to beneficially own 9,213,969 shares of the Issuer which are held of record by clients of Wellington Management.Percent of Class:7.56%-Number of shares as to which such person has:(sole power to vote or to direct the vote(ii)*shared power to vote or to direct the vote(iii)5sole power to dispose or to direct the disposition of(iv)7shared power to dispose or to direct the disposition ofItem 5.+Ownership of Five Percent or Less of Class.иIf this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: [ ]Item 6.@Ownership of More than Five Percent on Behalf of Another Person.)The securities as to which this Schedule is filed by Wellington Management, in its capacity as investment adviser, are owned of record by clients of Wellington Management. Those clients have the right to receive, or the power to direct the receipt of, dividends from, or the proceeds from the sale of, such securities. No such client is known to have such right or power with respect to more than five percent of this class of securities, except as follows: Not Applicable.Item 7.€Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.Not Applicable.Item 8.MIdentification and Classification of Members of the Group. Not Applicable.Item 9.2Notice of Dissolution of Group. Not Applicable.Item 10.ЯCertification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.By: /s/ John D. Norberg&--------------------------------------Name: John D. NorbergTitle: Vice President6Date: February 14, 2012џ UЇ cc ЛЬ d-Cыт6?_€%,С*+‚ƒ„&ffffffц?'ffffffц?(ш?)ш?Ё"d,, Ж` Ж`р? Ж` Ж`р?U} З} Й} А,,,§ § § § § § ьP№H№№0№( № №>Ж@<dggџџџџ ЛЬ d-Cыт6?_€%,С*+‚ƒ„&ffffffц?'ffffffц?(ш?)ш?Ё"d,, Ж` Ж`р? Ж` Ж`р?U} О} Й } Л} Й } А @ @, @,,,,  @  @  @  @~ § О ~  § О ~ § О ~ § О §  §  ~ §  ~ КЄ›§  ~ § ~ Ж1~ &§ О ~ *§ О ~ .§ О ~ 2§ О хJ     ьP№H №№0№( № №>Ж@<dggџџџџ ЛЬ d-Cыт6?_€%,С*+‚ƒ„&ffffffц?'ffffffц?(ш?)ш?Ё"d,, Ж` Ж`р? 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