Regulatory Requirements (Narrative) (Details) - USD ($) $ in Millions	Jan. 04, 2022	Jan. 03, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets			$ 667,270	$ 549,009	$ 294,000
Charles Schwab Premier Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets			39,200	31,600
Trust Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets			15,900	12,500
CS&Co [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash and investments required to be segregated and on deposit for regulatory purposes			38,400	39,200
CS&Co [Member] | Reserve Deposit [Member] | Subsequent Event [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net amount of segregated cash deposited into segregated reserve bank accounts	$ 1,500
TDAC [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash and investments required to be segregated and on deposit for regulatory purposes			$ 15,900	$ 14,500
TDAC [Member] | Reserve Deposit [Member] | Subsequent Event [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net amount of segregated cash deposited into segregated reserve bank accounts		$ 406