Net Assets Investment Company, Portfolio Turnover Schwab U.S. TIPS ETF [Member] Schwab U.S. TIPS ETF Schwab Short-Term U.S. Treasury ETF [Member] Schwab Short-Term U.S. Treasury ETF Schwab Intermediate-Term U.S. Treasury ETF [Member] Schwab Intermediate-Term U.S. Treasury ETF Schwab Long-Term U.S. Treasury ETF [Member] Schwab Long-Term U.S. Treasury ETF Schwab U.S. Aggregate Bond ETF [Member] Schwab U.S. Aggregate Bond ETF Schwab 1-5 Year Corporate Bond ETF [Member] Schwab 1-5 Year Corporate Bond ETF Schwab 5-10 Year Corporate Bond ETF [Member] Schwab 5-10 Year Corporate Bond ETF Schwab Municipal Bond ETF [Member] Schwab Municipal Bond ETF Schwab Core Bond ETF [Member] Schwab Core Bond ETF Schwab Ultra-Short Income ETF [Member] Schwab Ultra-Short Income ETF Schwab Government Money Market ETF [Member] Schwab Government Money Market ETF Bloomberg US Treasury Inflation-Linked Bond Index (Series-L)SM Bloomberg US Aggregate Bond Index [Member] Bloomberg US Aggregate Bond Index Bloomberg US Treasury 1-3 Year Index [Member] Bloomberg US Treasury 3-10 Year Index [Member] Bloomberg US Long Treasury Index [Member] Bloomberg US 1-5 Year Corporate Bond Index [Member] Bloomberg US 5-10 Year Corporate Bond Index [Member] ICE AMT-Free Core U.S. National Municipal Index [Member] Bloomberg Municipal Bond Index [Member] ICE BofA US 3-Month Treasury Bill Index [Member] Investment Type [Axis] Repurchase Agreements [Member] U.S. Government Agency Debt [Member] U.S. Treasury Debt [Member] Repurchase Agreements U.S. Government Agency [Member] Repurchase Agreements U.S. Treasury [Member] 1 to 7 Days [Member] 8 to 30 Days [Member] 31 to 60 Days [Member] 61 to 90 Days [Member] 91 to 180 Days [Member] Over 180 Days [Member] Corporates [Member] Commercial Paper [Member] Certificates of Deposit [Member] Variable Rate Demand Notes [Member] Securitized [Member] Government Related [Member] U.S. Treasury Obligations [Member] Short-Term Investments{1} [Member] Revenue Bonds [Member] General Obligation Bonds [Member] Pre-Refunded [Member] Other [Member] Short Term Investments [Member] Treasuries [Member]