    <SEC-DOCUMENT>0001193125-24-003411-index.html : 20240105
    <SEC-HEADER>0001193125-24-003411.hdr.sgml : 20240105
    <ACCEPTANCE-DATETIME>20240105163623
    ACCESSION NUMBER:		0001193125-24-003411
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		30
    CONFORMED PERIOD OF REPORT:	20231031
    FILED AS OF DATE:		20240105
    DATE AS OF CHANGE:		20240105
    EFFECTIVENESS DATE:		20240105

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Nuveen AMT-Free Municipal Credit Income Fund
    		CENTRAL INDEX KEY:			0001090116
    		ORGANIZATION NAME:
    		IRS NUMBER:				752998730
    		STATE OF INCORPORATION:			MA
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-09475
    		FILM NUMBER:		24516765

    	BUSINESS ADDRESS:
    		STREET 1:		333 WEST WACKER DRIVE
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60606
    		BUSINESS PHONE:		3129178146

    	MAIL ADDRESS:
    		STREET 1:		333 WEST WACKER DRIVE
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60606

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Nuveen Enhanced AMT-Free Municipal Credit Opportunities Fund
    		DATE OF NAME CHANGE:	20160411

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	NUVEEN DIVIDEND ADVANTAGE MUNICIPAL INCOME FUND
    		DATE OF NAME CHANGE:	20120106

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	NUVEEN INSURED DIVIDEND ADVANTAGE MUNICIPAL FUND
    		DATE OF NAME CHANGE:	19990709
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d576116dncsr.htm
    <DESCRIPTION>NUVEEN AMT-FREE MUNICIPAL CREDIT INCOME FUND
    <TEXT>
    Document 1 - file: d576116dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d576116dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT
    <TEXT>
    Document 2 - file: d576116dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d576116dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT
    <TEXT>
    Document 3 - file: d576116dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.IND PUB ACCT
    <SEQUENCE>4
    <FILENAME>d576116dex99indpubacct.htm
    <DESCRIPTION>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
    <TEXT>
    Document 4 - file: d576116dex99indpubacct.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYVOTE
    <SEQUENCE>5
    <FILENAME>d576116dex99proxyvote.htm
    <DESCRIPTION>EX-99.PROXYVOTE
    <TEXT>
    Document 5 - file: d576116dex99proxyvote.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>6
    <FILENAME>cik0001090116-20231031.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 6 - file: cik0001090116-20231031.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>7
    <FILENAME>cik0001090116-20231031_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
    <TEXT>
    Document 7 - file: cik0001090116-20231031_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>8
    <FILENAME>cik0001090116-20231031_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 8 - file: cik0001090116-20231031_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>9
    <FILENAME>cik0001090116-20231031_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 9 - file: cik0001090116-20231031_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g576116g55m01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g576116g55m01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g576116g55m02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g576116g55m02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g576116g55m03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g576116g55m03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g576116g55m04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g576116g55m04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g576116g55m05.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g576116g55m05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g576116g55m06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g576116g55m06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g576116g55m07.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g576116g55m07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g576116g55m08.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g576116g55m08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g576116g55m09.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g576116g55m09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g576116g55m10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g576116g55m10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g576116g55m11.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g576116g55m11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g576116g55m12.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g576116g55m12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>g576116g55m13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: g576116g55m13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>d576116dncsr_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: d576116dncsr_htm.html

    Document 24 - RAW XML: d576116dncsr_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>25
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>26
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>27
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>28
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: FilingSummary.html

    Document 28 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>31
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 31 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>32
    <FILENAME>0001193125-24-003411-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 32 - file: 0001193125-24-003411-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>