Label	Element	Value
Nuveen Core Impact Bond Fund
Prospectus [Line Items]	oef_ProspectusLineItems
Risk/Return [Heading]	oef_RiskReturnHeading	Nuveen Core Impact Bond Fund
Strategy Narrative [Text Block]	oef_StrategyNarrativeTextBlock	The following is hereby added after the final paragraph of the “Principal investment strategies” section beginning on page 32 of the Statutory Prospectus in the “Summary information” section for the Nuveen Core Impact Bond Fund: The Fund may also seek exposure to Regulation S fixed-income securities through investment in a Cayman Islands exempted company that is wholly owned and controlled by the Fund (the “Regulation S Subsidiary”). Regulation S securities are securities of U.S. and non- U.S. issuers that are issued through private placement offerings without registration with the Securities and Exchange Commission (“SEC”) pursuant to Regulation S under the Securities Act of 1933. The Regulation S Subsidiary is advised by Advisors and has the same investment objective as the Fund. The Regulation S Subsidiary may invest without limitation in Regulation S securities. The Fund may also seek exposure to certain bonds or fixed-income securities that are sold subject to selling restrictions generally designed to restrict the purchase of such bonds to non-U.S. persons (as defined for applicable U.S. federal income tax purposes) (“TEFRA Bonds”) through investment of up to 25% of its total assets in a separate Cayman Islands exempted company that is wholly owned and controlled by the Fund (the “TEFRA Bond Subsidiary”). The TEFRA Bond Subsidiary is advised by Advisors and has the same investment objective as the Fund. The TEFRA Bond Subsidiary may invest without limitation in TEFRA Bonds.
Nuveen Core Impact Bond Fund \| Regulation S Securities Risk [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Regulation S Securities Risk—The risk that Regulation S securities may be less liquid than publicly traded securities. Regulation S securities may not be subject to the disclosure and other investor protection requirements that would be applicable to publicly traded securities. As a result, Regulation S securities may involve a high degree of business and financial risk and may result in losses.
Nuveen Core Impact Bond Fund \| Risks of Investments in the Fund’s TEFRA Bond Subsidiary [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Risks of Investments in the Fund’s TEFRA Bond Subsidiary—The Fund may seek exposure to TEFRA Bonds through investment of up to 25% of its total assets in the TEFRA Bond Subsidiary. Under the applicable U.S. Treasury regulations, income from the TEFRA Bond Subsidiary will only be considered qualifying income under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), if certain conditions are met. The tax treatment of the investments in the TEFRA Bond Subsidiary could affect the character, timing and/or amount of the Fund’s taxable income or any gains and distributions made by the Fund.
Nuveen Core Impact Bond Fund \| Risks of Investments in the Fund’s Wholly Owned Subsidiaries [Member]
Prospectus [Line Items]	oef_ProspectusLineItems
Risk [Text Block]	oef_RiskTextBlock	Risks of Investments in the Fund’s Wholly Owned Subsidiaries—Neither the Regulation S Subsidiary nor the TEFRA Bond Subsidiary (together with the Regulation S Subsidiary, the “Subsidiaries”) is registered under the Investment Company Act of 1940 (the “1940 Act”), and the Subsidiaries are not subject to its investor protections (except as otherwise noted in the Prospectus). As an investor in the Subsidiaries, the Fund does not have all of the protections offered to investors by the 1940 Act. However, the Subsidiaries are wholly owned and controlled by the Fund and managed by Advisors. Therefore, the Fund’s ownership and control of the Subsidiaries make it unlikely that the Subsidiaries would take actions contrary to the interests of the Fund or its shareholders.

Label

Element

Value

Prospectus [Line Items]

oef_ProspectusLineItems

Risk/Return [Heading]

oef_RiskReturnHeading

Nuveen Core Impact Bond Fund

Strategy Narrative [Text Block]

oef_StrategyNarrativeTextBlock

The following is hereby added after the final paragraph of the “Principal investment strategies” section beginning on page 32 of the Statutory Prospectus in the “Summary information” section for the Nuveen Core Impact Bond Fund:

The Fund may also seek exposure to Regulation S fixed-income securities through investment in a Cayman Islands exempted company that is wholly owned and controlled by the Fund (the “Regulation S Subsidiary”). Regulation S securities are securities of U.S. and non- U.S. issuers that are issued through private placement offerings without registration with the Securities and Exchange Commission (“SEC”) pursuant to Regulation S under the Securities Act of 1933. The Regulation S Subsidiary is advised by Advisors and has the same investment objective as the Fund. The Regulation S Subsidiary may invest without limitation in Regulation S securities.

The Fund may also seek exposure to certain bonds or fixed-income securities that are sold subject to selling restrictions generally designed to restrict the purchase of such bonds to non-U.S. persons (as defined for applicable U.S. federal income tax purposes) (“TEFRA Bonds”) through investment of up to 25% of its total assets in a separate Cayman Islands exempted company that is wholly owned and controlled by the Fund (the “TEFRA Bond Subsidiary”). The TEFRA Bond Subsidiary is advised by Advisors and has the same investment objective as the Fund. The TEFRA Bond Subsidiary may invest without limitation in TEFRA Bonds.

Nuveen Core Impact Bond Fund | Regulation S Securities Risk [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Regulation S Securities Risk—The risk that Regulation S securities may be less liquid than publicly traded securities. Regulation S securities may not be subject to the disclosure and other investor protection requirements that would be applicable to publicly traded securities. As a result, Regulation S securities may involve a high degree of business and financial risk and may result in losses.

Nuveen Core Impact Bond Fund | Risks of Investments in the Fund’s TEFRA Bond Subsidiary [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Risks of Investments in the Fund’s TEFRA Bond Subsidiary—The Fund may seek exposure to TEFRA Bonds through investment of up to 25% of its total assets in the TEFRA Bond Subsidiary. Under the applicable U.S. Treasury regulations, income from the TEFRA Bond Subsidiary will only be considered qualifying income under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), if certain conditions are met. The tax treatment of the investments in the TEFRA Bond Subsidiary could affect the character, timing and/or amount of the Fund’s taxable income or any gains and distributions made by the Fund.

Nuveen Core Impact Bond Fund | Risks of Investments in the Fund’s Wholly Owned Subsidiaries [Member]

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Risks of Investments in the Fund’s Wholly Owned Subsidiaries—Neither the Regulation S Subsidiary nor the TEFRA Bond Subsidiary (together with the Regulation S Subsidiary, the “Subsidiaries”) is registered under the Investment Company Act of 1940 (the “1940 Act”), and the Subsidiaries are not subject to its investor protections (except as otherwise noted in the Prospectus). As an investor in the Subsidiaries, the Fund does not have all of the protections offered to investors by the 1940 Act. However, the Subsidiaries are wholly owned and controlled by the Fund and managed by Advisors. Therefore, the Fund’s ownership and control of the Subsidiaries make it unlikely that the Subsidiaries would take actions contrary to the interests of the Fund or its shareholders.