Net Assets Investment Company, Portfolio Turnover C000059932 [Member] Schwab Monthly Income Fund - Target Payout C000059933 [Member] Schwab Monthly Income Fund - Flexible Payout C000059934 [Member] Schwab Monthly Income Fund - Income Payout Income Payout Composite Index [Member] Flexible Payout Composite Index [Member] Target Payout Composite Index [Member] Standard & Poor's 500 Index [Member] Bloomberg US Aggregate Bond Index [Member] Investment Type [Axis] Fixed Income - Intermediate-Term Bond [Member] U.S. Stocks - Large-Cap [Member] International Stocks - Developed Markets [Member] Fixed Income - Short-Term Bond [Member] Fixed Income - Preferred [Member] Fixed Income - Long-Term Government Bond [Member] Fixed Income - Floating Rate Loans [Member] Real Estate - Global Real Estate [Member] Money Market Funds [Member] Fixed Income - High - Yield Bond [Member] Fixed Income - High - Yield Bond [Member] Schwab U.S. Dividend Equity ETF [Member] Schwab International Dividend Equity ETF [Member] Schwab High Yield Bond ETF [Member] Schwab 5-10 Year Corporate Bond ETF [Member] Schwab 1-5 Year Corporate Bond ETF [Member] Cohen And Steers Preferred Securities And Income Fund, Inc., Class I [Member] Schwab Long-Term U.S. Treasury ETF [Member] T Rowe Price Institutional Floating Rate Fund, Instutional Class [Member] Schwab Global Real Estate Fund [Member] Schwab U.S. Aggregate Bond Index Fund [Member] Schwab Government Money Fund, Ultra Shares [Member]