Fair Values of Assets and Liabilities (Fair Value Hierarchy for Financial Instruments Not Recorded at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Assets:
Securities held to maturity	$ 31,669		$ 29,490
Liabilities:
Allowance for loan losses	48		48		59	56
Residential real estate mortgages [Member]
Liabilities:
Allowance for loan losses	33		34		40	36
Home equity lines of credit [Member]
Liabilities:
Allowance for loan losses	15		14		19	20
Carrying Amount [Member]
Assets:
Cash and cash equivalents	6,122		6,565
Cash and investments segregated and on deposit for regulatory purposes	16,127		18,273
Receivables from brokers, dealers, and clearing organizations	482		509
Receivables from brokerage clients - net	14,566		13,949
Securities held to maturity	32,123		30,318
Loans to banking clients	12,639	[1]	12,467	[2]
Other assets	71		64
Total	82,130		82,145
Liabilities:
Deposits from banking clients	95,591		92,972
Payables to brokers, dealers, and clearing organizations	1,918		1,467
Payables to brokerage clients	32,308		35,333
Accrued expenses and other liabilities	607		680
Long-term debt	1,902		1,903
Total	132,326		132,355
Carrying Amount [Member] | Residential real estate mortgages [Member]
Assets:
Loans to banking clients	8,050	[1]	8,006	[2]
Carrying Amount [Member] | Home equity lines of credit [Member]
Assets:
Loans to banking clients	3,018	[1]	3,041	[2]
Carrying Amount [Member] | Personal loans secured by securities [Member]
Assets:
Loans to banking clients	1,536	[1]	1,384	[2]
Carrying Amount [Member] | Other [Member]
Assets:
Loans to banking clients	35	[1]	36	[2]
Carrying Amount [Member] | U.S. agency mortgage-backed securities [Member]
Assets:
Securities held to maturity	31,066		29,260
Carrying Amount [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets:
Securities held to maturity	957		958
Carrying Amount [Member] | Other securities [Member]
Assets:
Securities held to maturity	100		100
Fair Value [Member]
Assets:
Cash and cash equivalents	6,122		6,565
Cash and investments segregated and on deposit for regulatory purposes	16,127		18,273
Receivables from brokers, dealers, and clearing organizations	482		509
Receivables from brokerage clients - net	14,566		13,949
Securities held to maturity	31,669		29,490
Loans to banking clients	12,650	[1]	12,392	[2]
Other assets	71		64
Total	81,687		81,242
Liabilities:
Deposits from banking clients	95,591		92,972
Payables to brokers, dealers, and clearing organizations	1,918		1,467
Payables to brokerage clients	32,308		35,333
Accrued expenses and other liabilities	607		680
Long-term debt	1,995		1,989
Total	132,419		132,441
Fair Value [Member] | Residential real estate mortgages [Member]
Assets:
Loans to banking clients	7,900	[1]	7,930	[2]
Fair Value [Member] | Home equity lines of credit [Member]
Assets:
Loans to banking clients	3,180	[1]	3,043	[2]
Fair Value [Member] | Personal loans secured by securities [Member]
Assets:
Loans to banking clients	1,536	[1]	1,384	[2]
Fair Value [Member] | Other [Member]
Assets:
Loans to banking clients	34	[1]	35	[2]
Fair Value [Member] | U.S. agency mortgage-backed securities [Member]
Assets:
Securities held to maturity	30,658		28,500
Fair Value [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets:
Securities held to maturity	911		890
Fair Value [Member] | Other securities [Member]
Assets:
Securities held to maturity	100		100
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash and cash equivalents	6,122		6,565
Cash and investments segregated and on deposit for regulatory purposes	16,127		18,273
Receivables from brokers, dealers, and clearing organizations	482		509
Receivables from brokerage clients - net	14,566		13,949
Securities held to maturity	31,669		29,490
Loans to banking clients	12,650	[1]	12,392	[2]
Other assets	71		64
Total	81,687		81,242
Liabilities:
Deposits from banking clients	95,591		92,972
Payables to brokers, dealers, and clearing organizations	1,918		1,467
Payables to brokerage clients	32,308		35,333
Accrued expenses and other liabilities	607		680
Long-term debt	1,995		1,989
Total	132,419		132,441
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Residential real estate mortgages [Member]
Assets:
Loans to banking clients	7,900	[1]	7,930	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Home equity lines of credit [Member]
Assets:
Loans to banking clients	3,180	[1]	3,043	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Personal loans secured by securities [Member]
Assets:
Loans to banking clients	1,536	[1]	1,384	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member]
Assets:
Loans to banking clients	34	[1]	35	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. agency mortgage-backed securities [Member]
Assets:
Securities held to maturity	30,658		28,500
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets:
Securities held to maturity	911		890
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other securities [Member]
Assets:
Securities held to maturity	$ 100		$ 100

[1] The carrying value of loans to banking clients excludes the allowance for loan losses of $48 million at March 31, 2014.

[2] The carrying value of loans to banking clients excludes the allowance for loan losses of $48 million at December 31, 2013.