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Dec. 31, 2022
shares
Cover [Abstract]  
Entity Central Index Key 0000916183
Amendment Flag false
Document Type N-CSRS
Entity Registrant Name PIMCO Strategic Income Fund, Inc.
General Description of Registrant [Abstract]  
Investment Objectives and Practices [Text Block]
Investment Objective and Strategy Overview
The Fund’s primary investment objective is to generate a level of income that is higher than that generated by high quality, intermediate-term U.S. debt securities. The Fund also seeks capital appreciation to the extent consistent with this objective.
Fund Insights at NAV
The following affected performance (on a gross basis) during the reporting period:
»   Interest rate exposure, most notably short exposure focused in the intermediate and long portions of the curve contributed to absolute performance as rates rose.
»   Exposure to external emerging market debt contributed to absolute performance as the sector posted positive performance.
»   Security selection within U.S. commercial mortgage credit contributed to absolute performance as the securities posted positive returns.
»   Exposure to agency residential mortgage securities detracted from absolute performance as the sector posted negative performance.
»   Exposure to bank capital detracted from absolute performance as the sector posted negative performance.
»   Exposure to asset-backed securities detracted from absolute performance as the sector posted negative performance.
Common Shares [Member]  
Capital Stock, Long-Term Debt, and Other Securities [Abstract]  
Outstanding Security, Title [Text Block] Common Shares
Outstanding Security, Held [Shares] 45,198