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Subsequent Event - Additional Information (Detail) (Subsequent Event, Trust Preferred Securities, USD $)
In Millions, unless otherwise specified
1 Months Ended
Jul. 31, 2012
Subsequent Event | Trust Preferred Securities
 
Subsequent Event [Line Items]  
Fixed-to-floating rate trust preferred securities issued by Schwab Capital Trust I to be redeemed $ 300
Trust preferred securities redemption date Aug. 31, 2012
Percentage of the liquidation amount of each trust preferred security included in the redemption 100.00%