The Charles Schwab Corporation – Parent Company Only Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 14,217	$ 10,828	$ 11,978	$ 11,363
Held to maturity securities	120,926	75,203
Other securities owned — at fair value	539	449
Other assets	1,949	1,408
Total assets	243,274	223,383
Liabilities and Stockholders’ Equity
Accrued expenses and other liabilities	2,810	2,331
Long-term debt	4,753	2,876
Total liabilities	224,749	206,962
Stockholders’ equity	18,525	16,421	13,402	11,803
Total liabilities and stockholders’ equity	243,274	223,383
Parent Company [Member]
Assets
Cash and cash equivalents	2,825	1,189	$ 1,007	$ 1,043
Receivables from subsidiaries	571	503
Available for sale securities	573	569
Held to maturity securities	223	223
Other securities owned — at fair value	76	75
Loans to non-bank subsidiaries	448	0
Investment in non-bank subsidiaries	5,393	5,044
Investment in bank subsidiary	13,224	11,726
Other assets	160	124
Total assets	23,493	19,453
Liabilities and Stockholders’ Equity
Accrued expenses and other liabilities	276	219
Payables to subsidiaries	0	6
Long-term debt	4,692	2,807
Total liabilities	4,968	3,032
Stockholders’ equity	18,525	16,421
Total liabilities and stockholders’ equity	$ 23,493	$ 19,453