Label	Element	Value
International Equity Portfolio
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	ck0001003239_SupplementTextBlock	SEASONS SERIES TRUST International Equity Portfolio Mid Cap Value Portfolio Multi-Managed Growth Portfolio Multi-Managed Income Portfolio Multi-Managed Income/Equity Portfolio Multi-Managed Moderate Growth Portfolio (each a “Portfolio,” and collectively, the “Portfolios”) Supplement to the Statutory Prospectus dated July 29, 2014 The following changes will become effective on or about October 17, 2014: International Equity Portfolio
Risk/Return [Heading]	rr_RiskReturnHeading	International Equity Portfolio
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	In the Portfolio Summary, in the Principal Investment Strategies of the Portfolio, the third paragraph is deleted in its entirety and replaced with the following: The Portfolio is actively-managed by two subadvisers. To balance the risks of the Portfolio, a third portion of the Portfolio is passively-managed by the adviser who seeks to track an index or a subset of an index.

Principal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 4

-Subsection a

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Namespace Prefix:	rr_
Data Type:	nonnum:textBlockItemType
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Period Type:	duration