Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Period End Date	dei_DocumentPeriodEndDate	Aug. 31, 2022
Registrant Name	dei_EntityRegistrantName	PRINCIPAL FUNDS, INC.
CIK	dei_EntityCentralIndexKey	0000898745
Amendment Flag	dei_AmendmentFlag	false
Document Created Date	dei_DocumentCreationDate	Dec. 28, 2022
Document Effective Date	dei_DocumentEffectiveDate	Dec. 31, 2022
Prospectus Date	rr_ProspectusDate	Dec. 31, 2022
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A
Blue Chip Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBLAX
Blue Chip Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBLCX
Blue Chip Fund \| Class J
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBCJX
Blue Chip Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBCKX
Blue Chip Fund \| Class R-3
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGBEX
Blue Chip Fund \| Class R-4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGBFX
Blue Chip Fund \| Class R-5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGBGX
Blue Chip Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGBHX
Bond Market Index Fund \| Class J
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBIJX
Bond Market Index Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PNIIX
Bond Market Index Fund \| Class R-1
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBIMX
Bond Market Index Fund \| Class R-3
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBOIX
Bond Market Index Fund \| Class R-4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBIPX
Bond Market Index Fund \| Class R-5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PBIQX
Capital Securities Fund \| Class S
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PCSFX
Diversified Real Asset Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PRDAX
Diversified Real Asset Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PDRDX
Diversified Real Asset Fund \| Class R-3
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGDRX
Diversified Real Asset Fund \| Class R-5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGDTX
Diversified Real Asset Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PDARX
Edge MidCap Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PEMCX
Edge MidCap Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PEDGX
Edge MidCap Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PEDMX
Global Multi-Strategy Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PMSAX
Global Multi-Strategy Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PSMIX
Global Multi-Strategy Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PGLSX
International Equity Index Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PIDIX
International Equity Index Fund \| Class R-1
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PILIX
International Equity Index Fund \| Class R-3
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PIIOX
International Equity Index Fund \| Class R-4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PIIPX
International Equity Index Fund \| Class R-5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PIIQX
International Equity Index Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PFIEX
International Small Company Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PISMX
International Small Company Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PFISX
Opportunistic Municipal Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PMOAX
Opportunistic Municipal Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	POMFX
Origin Emerging Markets Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	POEYX
Origin Emerging Markets Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	POEIX
Origin Emerging Markets Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	POEFX
Small-MidCap Dividend Income Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PMDAX
Small-MidCap Dividend Income Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PMDDX
Small-MidCap Dividend Income Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PMDIX
Small-MidCap Dividend Income Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PMDHX
Small-MidCap Growth Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PSMHX
Spectrum Preferred and Capital Securities Income Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PPSAX
Spectrum Preferred and Capital Securities Income Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PRFCX
Spectrum Preferred and Capital Securities Income Fund \| Class J
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PPSJX
Spectrum Preferred and Capital Securities Income Fund \| Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PPSIX
Spectrum Preferred and Capital Securities Income Fund \| Class R-1
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PUSAX
Spectrum Preferred and Capital Securities Income Fund \| Class R-3
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PNARX
Spectrum Preferred and Capital Securities Income Fund \| Class R-4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PQARX
Spectrum Preferred and Capital Securities Income Fund \| Class R-5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PPARX
Spectrum Preferred and Capital Securities Income Fund \| Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PPREX

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- Definition

The date the document was made available and submitted, in YYYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.

+ References

No definition available.

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- Definition

The date when a document, upon receipt and acceptance, becomes officially effective, in YYYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.

+ References

No definition available.

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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No definition available.

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- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

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- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2

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- Definition

One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-T
-Number 232
-Section 313

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- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2

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- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

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- Definition

The date of the prospectus.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form
-Number N-1A
-Chapter A
-Section 1
-Subsection a
-Paragraph 3

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Namespace Prefix:	rr_
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- References

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