Net Assets Investment Company, Portfolio Turnover C000026249 [Member] SMALLCAP World Fund - Class A C000026256 [Member] SMALLCAP World Fund - Class C C000189499 [Member] SMALLCAP World Fund - Class T C000026257 [Member] SMALLCAP World Fund - Class F-1 C000068590 [Member] SMALLCAP World Fund - Class F-2 C000180011 [Member] SMALLCAP World Fund - Class F-3 C000026258 [Member] SMALLCAP World Fund - Class 529-A C000026260 [Member] SMALLCAP World Fund - Class 529-C C000026261 [Member] SMALLCAP World Fund - Class 529-E C000189498 [Member] SMALLCAP World Fund - Class 529-T C000026262 [Member] SMALLCAP World Fund - Class 529-F-1 C000224599 [Member] SMALLCAP World Fund - Class 529-F-2 C000224600 [Member] SMALLCAP World Fund - Class 529-F-3 C000026250 [Member] SMALLCAP World Fund - Class R-1 C000026251 [Member] SMALLCAP World Fund - Class R-2 C000148446 [Member] SMALLCAP World Fund - Class R-2E C000026252 [Member] SMALLCAP World Fund - Class R-3 C000026253 [Member] SMALLCAP World Fund - Class R-4 C000164808 [Member] SMALLCAP World Fund - Class R-5E C000026254 [Member] SMALLCAP World Fund - Class R-5 C000077882 [Member] SMALLCAP World Fund - Class R-6 Investment Type [Axis] Financial Services Sector [Member] Healthcare Sector [Member] Other securities [Member] Bonds, Notes And Other Debt Instruments [Member] Short Term Securities And Other Assets Less Liabilities [Member] Short-term securities & other assets less liabilities [Member]