Regulatory Requirements - Narrative (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets	[1]	$ 475,204	$ 551,772
Charles Schwab Premier Bank, SSB
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets		27,600
Charles Schwab Trust Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets		$ 11,400

[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.