Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

DWS PORTFOLIO TRUST

Prospectus Date

rr_ProspectusDate

Apr. 25, 2013

Supplement [Text Block]

dpt1_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES AND SUMMARY PROSPECTUSES OF EACH OF THE LISTED FUNDS

DWS Floating Rate Fund

DWS Global Inflation Fund

DWS Unconstrained Income Fund

DWS Unconstrained Income VIP

The following changes are effective on or about May 31, 2013:

All disclosure and references in each fund’s prospectus to the ”Global Tactical Asset Allocation Overlay Strategy,” ”GTAA,” ”GTAA strategy” or ”GTAA risk” are hereby deleted.

DWS PORTFOLIO TRUST | DWS Floating Rate Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

dpt1_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES AND SUMMARY PROSPECTUSES OF EACH OF THE LISTED FUNDS

DWS Floating Rate Fund

The following changes are effective on or about May 31, 2013:

All disclosure and references in each fund’s prospectus to the ”Global Tactical Asset Allocation Overlay Strategy,” ”GTAA,” ”GTAA strategy” or ”GTAA risk” are hereby deleted.

DWS INCOME TRUST | DWS Global Inflation Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

dpt1_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES AND SUMMARY PROSPECTUSES OF EACH OF THE LISTED FUNDS

DWS Global Inflation Fund

The following changes are effective on or about May 31, 2013:

All disclosure and references in each fund’s prospectus to the ”Global Tactical Asset Allocation Overlay Strategy,” ”GTAA,” ”GTAA strategy” or ”GTAA risk” are hereby deleted.

DWS INCOME TRUST | DWS Unconstrained Income Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

dpt1_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES AND SUMMARY PROSPECTUSES OF EACH OF THE LISTED FUNDS

DWS Unconstrained Income Fund

The following changes are effective on or about May 31, 2013:

All disclosure and references in each fund’s prospectus to the ”Global Tactical Asset Allocation Overlay Strategy,” ”GTAA,” ”GTAA strategy” or ”GTAA risk” are hereby deleted.

DWS VARIABLE SERIES II | DWS Unconstrained Income VIP

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

dpt1_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES AND SUMMARY PROSPECTUSES OF EACH OF THE LISTED FUNDS

DWS Unconstrained Income VIP

The following changes are effective on or about May 31, 2013:

All disclosure and references in each fund’s prospectus to the ”Global Tactical Asset Allocation Overlay Strategy,” ”GTAA,” ”GTAA strategy” or ”GTAA risk” are hereby deleted.